diff --git a/ql/extractor/src/generator.rs b/ql/extractor/src/generator.rs
index 96ce5319dd19..7f8ca718344c 100644
--- a/ql/extractor/src/generator.rs
+++ b/ql/extractor/src/generator.rs
@@ -44,6 +44,7 @@ pub fn run(options: Options) -> std::io::Result<()> {
         languages,
         options.dbscheme,
         options.library,
+        false, // do not use facade AST
         "run 'scripts/create-extractor-pack.sh' in ql/",
     )
 }
diff --git a/ql/ql/src/codeql_ql/ast/internal/TreeSitter.qll b/ql/ql/src/codeql_ql/ast/internal/TreeSitter.qll
index e2aedc401f7a..51424106719d 100644
--- a/ql/ql/src/codeql_ql/ast/internal/TreeSitter.qll
+++ b/ql/ql/src/codeql_ql/ast/internal/TreeSitter.qll
@@ -25,8 +25,10 @@ private predicate discardLocation(@location_default loc) {
 
 overlay[local]
 module QL {
+  private module F = QL;
+
   /** The base class for all AST nodes */
-  private class AstNodeImpl extends @ql_ast_node {
+  class AstNode extends @ql_ast_node {
     /** Gets a string representation of this element. */
     string toString() { result = this.getAPrimaryQlClass() }
 
@@ -34,13 +36,13 @@ module QL {
     final L::Location getLocation() { ql_ast_node_location(this, result) }
 
     /** Gets the parent of this element. */
-    final AstNode getParent() { ql_ast_node_parent(this, result, _) }
+    final F::AstNode getParent() { ql_ast_node_parent(this, result, _) }
 
     /** Gets the index of this node among the children of its parent. */
     final int getParentIndex() { ql_ast_node_parent(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    AstNode getAFieldOrChild() { none() }
+    F::AstNode getAFieldOrChild() { none() }
 
     /** Gets the name of the primary QL class for this element. */
     string getAPrimaryQlClass() { result = "???" }
@@ -49,10 +51,8 @@ module QL {
     string getPrimaryQlClasses() { result = concat(this.getAPrimaryQlClass(), ",") }
   }
 
-  final class AstNode = AstNodeImpl;
-
   /** A token. */
-  private class TokenImpl extends @ql_token, AstNodeImpl {
+  class Token extends @ql_token, F::AstNode {
     /** Gets the value of this token. */
     final string getValue() { ql_tokeninfo(this, _, result) }
 
@@ -63,10 +63,8 @@ module QL {
     override string getAPrimaryQlClass() { result = "Token" }
   }
 
-  final class Token = TokenImpl;
-
   /** A reserved word. */
-  final class ReservedWord extends @ql_reserved_word, TokenImpl {
+  class ReservedWord extends @ql_reserved_word, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ReservedWord" }
   }
@@ -92,21 +90,21 @@ module QL {
   }
 
   /** A class representing `add_expr` nodes. */
-  final class AddExpr extends @ql_add_expr, AstNodeImpl {
+  class AddExpr extends @ql_add_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AddExpr" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ql_add_expr_def(this, result, _, _) }
+    final F::AstNode getLeft() { ql_add_expr_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ql_add_expr_def(this, _, result, _) }
+    final F::AstNode getRight() { ql_add_expr_def(this, _, result, _) }
 
     /** Gets the child of this node. */
-    final Addop getChild() { ql_add_expr_def(this, _, _, result) }
+    final F::Addop getChild() { ql_add_expr_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_add_expr_def(this, result, _, _) or
       ql_add_expr_def(this, _, result, _) or
       ql_add_expr_def(this, _, _, result)
@@ -114,211 +112,237 @@ module QL {
   }
 
   /** A class representing `addop` tokens. */
-  final class Addop extends @ql_token_addop, TokenImpl {
+  class Addop extends @ql_token_addop, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Addop" }
   }
 
   /** A class representing `aggId` tokens. */
-  final class AggId extends @ql_token_agg_id, TokenImpl {
+  class AggId extends @ql_token_agg_id, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AggId" }
   }
 
   /** A class representing `aggregate` nodes. */
-  final class Aggregate extends @ql_aggregate, AstNodeImpl {
+  class Aggregate extends @ql_aggregate, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Aggregate" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_aggregate_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_aggregate_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_aggregate_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_aggregate_child(this, _, result) }
   }
 
   /** A class representing `annotArg` nodes. */
-  final class AnnotArg extends @ql_annot_arg, AstNodeImpl {
+  class AnnotArg extends @ql_annot_arg, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AnnotArg" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_annot_arg_def(this, result) }
+    final F::AstNode getChild() { ql_annot_arg_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_annot_arg_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_annot_arg_def(this, result) }
   }
 
   /** A class representing `annotName` tokens. */
-  final class AnnotName extends @ql_token_annot_name, TokenImpl {
+  class AnnotName extends @ql_token_annot_name, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AnnotName" }
   }
 
   /** A class representing `annotation` nodes. */
-  final class Annotation extends @ql_annotation, AstNodeImpl {
+  class Annotation extends @ql_annotation, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Annotation" }
 
     /** Gets the node corresponding to the field `args`. */
-    final AstNode getArgs(int i) { ql_annotation_args(this, i, result) }
+    final F::AstNode getArgs(int i) { ql_annotation_args(this, i, result) }
+
+    /** Gets the node corresponding to the field `args`. */
+    final F::AstNode getAnArgs() { result = this.getArgs(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final AnnotName getName() { ql_annotation_def(this, result) }
+    final F::AnnotName getName() { ql_annotation_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_annotation_args(this, _, result) or ql_annotation_def(this, result)
     }
   }
 
   /** A class representing `aritylessPredicateExpr` nodes. */
-  final class AritylessPredicateExpr extends @ql_arityless_predicate_expr, AstNodeImpl {
+  class AritylessPredicateExpr extends @ql_arityless_predicate_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AritylessPredicateExpr" }
 
     /** Gets the node corresponding to the field `name`. */
-    final LiteralId getName() { ql_arityless_predicate_expr_def(this, result) }
+    final F::LiteralId getName() { ql_arityless_predicate_expr_def(this, result) }
 
     /** Gets the node corresponding to the field `qualifier`. */
-    final ModuleExpr getQualifier() { ql_arityless_predicate_expr_qualifier(this, result) }
+    final F::ModuleExpr getQualifier() { ql_arityless_predicate_expr_qualifier(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_arityless_predicate_expr_def(this, result) or
       ql_arityless_predicate_expr_qualifier(this, result)
     }
   }
 
   /** A class representing `asExpr` nodes. */
-  final class AsExpr extends @ql_as_expr, AstNodeImpl {
+  class AsExpr extends @ql_as_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AsExpr" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_as_expr_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_as_expr_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_as_expr_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_as_expr_child(this, _, result) }
   }
 
   /** A class representing `asExprs` nodes. */
-  final class AsExprs extends @ql_as_exprs, AstNodeImpl {
+  class AsExprs extends @ql_as_exprs, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AsExprs" }
 
     /** Gets the `i`th child of this node. */
-    final AsExpr getChild(int i) { ql_as_exprs_child(this, i, result) }
+    final F::AsExpr getChild(int i) { ql_as_exprs_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AsExpr getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_as_exprs_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_as_exprs_child(this, _, result) }
   }
 
   /** A class representing `block_comment` tokens. */
-  final class BlockComment extends @ql_token_block_comment, TokenImpl {
+  class BlockComment extends @ql_token_block_comment, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BlockComment" }
   }
 
   /** A class representing `body` nodes. */
-  final class Body extends @ql_body, AstNodeImpl {
+  class Body extends @ql_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Body" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_body_def(this, result) }
+    final F::AstNode getChild() { ql_body_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_body_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_body_def(this, result) }
   }
 
   /** A class representing `bool` nodes. */
-  final class Bool extends @ql_bool, AstNodeImpl {
+  class Bool extends @ql_bool, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Bool" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_bool_def(this, result) }
+    final F::AstNode getChild() { ql_bool_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_bool_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_bool_def(this, result) }
   }
 
   /** A class representing `call_body` nodes. */
-  final class CallBody extends @ql_call_body, AstNodeImpl {
+  class CallBody extends @ql_call_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CallBody" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_call_body_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_call_body_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_call_body_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_call_body_child(this, _, result) }
   }
 
   /** A class representing `call_or_unqual_agg_expr` nodes. */
-  final class CallOrUnqualAggExpr extends @ql_call_or_unqual_agg_expr, AstNodeImpl {
+  class CallOrUnqualAggExpr extends @ql_call_or_unqual_agg_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CallOrUnqualAggExpr" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_call_or_unqual_agg_expr_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_call_or_unqual_agg_expr_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_call_or_unqual_agg_expr_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() {
+      ql_call_or_unqual_agg_expr_child(this, _, result)
+    }
   }
 
   /** A class representing `charpred` nodes. */
-  final class Charpred extends @ql_charpred, AstNodeImpl {
+  class Charpred extends @ql_charpred, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Charpred" }
 
     /** Gets the node corresponding to the field `body`. */
-    final AstNode getBody() { ql_charpred_def(this, result, _) }
+    final F::AstNode getBody() { ql_charpred_def(this, result, _) }
 
     /** Gets the child of this node. */
-    final ClassName getChild() { ql_charpred_def(this, _, result) }
+    final F::ClassName getChild() { ql_charpred_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_charpred_def(this, result, _) or ql_charpred_def(this, _, result)
     }
   }
 
   /** A class representing `classMember` nodes. */
-  final class ClassMember extends @ql_class_member, AstNodeImpl {
+  class ClassMember extends @ql_class_member, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ClassMember" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_class_member_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_class_member_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_class_member_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_class_member_child(this, _, result) }
   }
 
   /** A class representing `className` tokens. */
-  final class ClassName extends @ql_token_class_name, TokenImpl {
+  class ClassName extends @ql_token_class_name, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ClassName" }
   }
 
   /** A class representing `classlessPredicate` nodes. */
-  final class ClasslessPredicate extends @ql_classless_predicate, AstNodeImpl {
+  class ClasslessPredicate extends @ql_classless_predicate, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ClasslessPredicate" }
 
     /** Gets the node corresponding to the field `name`. */
-    final PredicateName getName() { ql_classless_predicate_def(this, result, _) }
+    final F::PredicateName getName() { ql_classless_predicate_def(this, result, _) }
 
     /** Gets the node corresponding to the field `returnType`. */
-    final AstNode getReturnType() { ql_classless_predicate_def(this, _, result) }
+    final F::AstNode getReturnType() { ql_classless_predicate_def(this, _, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_classless_predicate_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_classless_predicate_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_classless_predicate_def(this, result, _) or
       ql_classless_predicate_def(this, _, result) or
       ql_classless_predicate_child(this, _, result)
@@ -326,27 +350,27 @@ module QL {
   }
 
   /** A class representing `closure` tokens. */
-  final class Closure extends @ql_token_closure, TokenImpl {
+  class Closure extends @ql_token_closure, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Closure" }
   }
 
   /** A class representing `comp_term` nodes. */
-  final class CompTerm extends @ql_comp_term, AstNodeImpl {
+  class CompTerm extends @ql_comp_term, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CompTerm" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ql_comp_term_def(this, result, _, _) }
+    final F::AstNode getLeft() { ql_comp_term_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ql_comp_term_def(this, _, result, _) }
+    final F::AstNode getRight() { ql_comp_term_def(this, _, result, _) }
 
     /** Gets the child of this node. */
-    final Compop getChild() { ql_comp_term_def(this, _, _, result) }
+    final F::Compop getChild() { ql_comp_term_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_comp_term_def(this, result, _, _) or
       ql_comp_term_def(this, _, result, _) or
       ql_comp_term_def(this, _, _, result)
@@ -354,47 +378,56 @@ module QL {
   }
 
   /** A class representing `compop` tokens. */
-  final class Compop extends @ql_token_compop, TokenImpl {
+  class Compop extends @ql_token_compop, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Compop" }
   }
 
   /** A class representing `conjunction` nodes. */
-  final class Conjunction extends @ql_conjunction, AstNodeImpl {
+  class Conjunction extends @ql_conjunction, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Conjunction" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ql_conjunction_def(this, result, _) }
+    final F::AstNode getLeft() { ql_conjunction_def(this, result, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ql_conjunction_def(this, _, result) }
+    final F::AstNode getRight() { ql_conjunction_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_conjunction_def(this, result, _) or ql_conjunction_def(this, _, result)
     }
   }
 
   /** A class representing `dataclass` nodes. */
-  final class Dataclass extends @ql_dataclass, AstNodeImpl {
+  class Dataclass extends @ql_dataclass, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Dataclass" }
 
     /** Gets the node corresponding to the field `extends`. */
-    final AstNode getExtends(int i) { ql_dataclass_extends(this, i, result) }
+    final F::AstNode getExtends(int i) { ql_dataclass_extends(this, i, result) }
+
+    /** Gets the node corresponding to the field `extends`. */
+    final F::AstNode getAnExtends() { result = this.getExtends(_) }
+
+    /** Gets the node corresponding to the field `instanceof`. */
+    final F::AstNode getInstanceof(int i) { ql_dataclass_instanceof(this, i, result) }
 
     /** Gets the node corresponding to the field `instanceof`. */
-    final AstNode getInstanceof(int i) { ql_dataclass_instanceof(this, i, result) }
+    final F::AstNode getAnInstanceof() { result = this.getInstanceof(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final ClassName getName() { ql_dataclass_def(this, result) }
+    final F::ClassName getName() { ql_dataclass_def(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_dataclass_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_dataclass_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_dataclass_extends(this, _, result) or
       ql_dataclass_instanceof(this, _, result) or
       ql_dataclass_def(this, result) or
@@ -403,119 +436,125 @@ module QL {
   }
 
   /** A class representing `datatype` nodes. */
-  final class Datatype extends @ql_datatype, AstNodeImpl {
+  class Datatype extends @ql_datatype, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Datatype" }
 
     /** Gets the node corresponding to the field `name`. */
-    final ClassName getName() { ql_datatype_def(this, result, _) }
+    final F::ClassName getName() { ql_datatype_def(this, result, _) }
 
     /** Gets the child of this node. */
-    final DatatypeBranches getChild() { ql_datatype_def(this, _, result) }
+    final F::DatatypeBranches getChild() { ql_datatype_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_datatype_def(this, result, _) or ql_datatype_def(this, _, result)
     }
   }
 
   /** A class representing `datatypeBranch` nodes. */
-  final class DatatypeBranch extends @ql_datatype_branch, AstNodeImpl {
+  class DatatypeBranch extends @ql_datatype_branch, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "DatatypeBranch" }
 
     /** Gets the node corresponding to the field `name`. */
-    final ClassName getName() { ql_datatype_branch_def(this, result) }
+    final F::ClassName getName() { ql_datatype_branch_def(this, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getChild(int i) { ql_datatype_branch_child(this, i, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_datatype_branch_child(this, i, result) }
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_datatype_branch_def(this, result) or ql_datatype_branch_child(this, _, result)
     }
   }
 
   /** A class representing `datatypeBranches` nodes. */
-  final class DatatypeBranches extends @ql_datatype_branches, AstNodeImpl {
+  class DatatypeBranches extends @ql_datatype_branches, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "DatatypeBranches" }
 
     /** Gets the `i`th child of this node. */
-    final DatatypeBranch getChild(int i) { ql_datatype_branches_child(this, i, result) }
+    final F::DatatypeBranch getChild(int i) { ql_datatype_branches_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::DatatypeBranch getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_datatype_branches_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_datatype_branches_child(this, _, result) }
   }
 
   /** A class representing `dbtype` tokens. */
-  final class Dbtype extends @ql_token_dbtype, TokenImpl {
+  class Dbtype extends @ql_token_dbtype, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Dbtype" }
   }
 
   /** A class representing `direction` tokens. */
-  final class Direction extends @ql_token_direction, TokenImpl {
+  class Direction extends @ql_token_direction, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Direction" }
   }
 
   /** A class representing `disjunction` nodes. */
-  final class Disjunction extends @ql_disjunction, AstNodeImpl {
+  class Disjunction extends @ql_disjunction, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Disjunction" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ql_disjunction_def(this, result, _) }
+    final F::AstNode getLeft() { ql_disjunction_def(this, result, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ql_disjunction_def(this, _, result) }
+    final F::AstNode getRight() { ql_disjunction_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_disjunction_def(this, result, _) or ql_disjunction_def(this, _, result)
     }
   }
 
   /** A class representing `empty` tokens. */
-  final class Empty extends @ql_token_empty, TokenImpl {
+  class Empty extends @ql_token_empty, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Empty" }
   }
 
   /** A class representing `expr_aggregate_body` nodes. */
-  final class ExprAggregateBody extends @ql_expr_aggregate_body, AstNodeImpl {
+  class ExprAggregateBody extends @ql_expr_aggregate_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ExprAggregateBody" }
 
     /** Gets the node corresponding to the field `asExprs`. */
-    final AsExprs getAsExprs() { ql_expr_aggregate_body_def(this, result) }
+    final F::AsExprs getAsExprs() { ql_expr_aggregate_body_def(this, result) }
 
     /** Gets the node corresponding to the field `orderBys`. */
-    final OrderBys getOrderBys() { ql_expr_aggregate_body_order_bys(this, result) }
+    final F::OrderBys getOrderBys() { ql_expr_aggregate_body_order_bys(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_expr_aggregate_body_def(this, result) or ql_expr_aggregate_body_order_bys(this, result)
     }
   }
 
   /** A class representing `expr_annotation` nodes. */
-  final class ExprAnnotation extends @ql_expr_annotation, AstNodeImpl {
+  class ExprAnnotation extends @ql_expr_annotation, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ExprAnnotation" }
 
     /** Gets the node corresponding to the field `annot_arg`. */
-    final AnnotName getAnnotArg() { ql_expr_annotation_def(this, result, _, _) }
+    final F::AnnotName getAnnotArg() { ql_expr_annotation_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `name`. */
-    final AnnotName getName() { ql_expr_annotation_def(this, _, result, _) }
+    final F::AnnotName getName() { ql_expr_annotation_def(this, _, result, _) }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_expr_annotation_def(this, _, _, result) }
+    final F::AstNode getChild() { ql_expr_annotation_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_expr_annotation_def(this, result, _, _) or
       ql_expr_annotation_def(this, _, result, _) or
       ql_expr_annotation_def(this, _, _, result)
@@ -523,48 +562,51 @@ module QL {
   }
 
   /** A class representing `false` tokens. */
-  final class False extends @ql_token_false, TokenImpl {
+  class False extends @ql_token_false, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "False" }
   }
 
   /** A class representing `field` nodes. */
-  final class Field extends @ql_field, AstNodeImpl {
+  class Field extends @ql_field, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Field" }
 
     /** Gets the child of this node. */
-    final VarDecl getChild() { ql_field_def(this, result) }
+    final F::VarDecl getChild() { ql_field_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_field_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_field_def(this, result) }
   }
 
   /** A class representing `float` tokens. */
-  final class Float extends @ql_token_float, TokenImpl {
+  class Float extends @ql_token_float, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Float" }
   }
 
   /** A class representing `full_aggregate_body` nodes. */
-  final class FullAggregateBody extends @ql_full_aggregate_body, AstNodeImpl {
+  class FullAggregateBody extends @ql_full_aggregate_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "FullAggregateBody" }
 
     /** Gets the node corresponding to the field `asExprs`. */
-    final AsExprs getAsExprs() { ql_full_aggregate_body_as_exprs(this, result) }
+    final F::AsExprs getAsExprs() { ql_full_aggregate_body_as_exprs(this, result) }
 
     /** Gets the node corresponding to the field `guard`. */
-    final AstNode getGuard() { ql_full_aggregate_body_guard(this, result) }
+    final F::AstNode getGuard() { ql_full_aggregate_body_guard(this, result) }
 
     /** Gets the node corresponding to the field `orderBys`. */
-    final OrderBys getOrderBys() { ql_full_aggregate_body_order_bys(this, result) }
+    final F::OrderBys getOrderBys() { ql_full_aggregate_body_order_bys(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final VarDecl getChild(int i) { ql_full_aggregate_body_child(this, i, result) }
+    final F::VarDecl getChild(int i) { ql_full_aggregate_body_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::VarDecl getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_full_aggregate_body_as_exprs(this, result) or
       ql_full_aggregate_body_guard(this, result) or
       ql_full_aggregate_body_order_bys(this, result) or
@@ -573,38 +615,41 @@ module QL {
   }
 
   /** A class representing `higherOrderTerm` nodes. */
-  final class HigherOrderTerm extends @ql_higher_order_term, AstNodeImpl {
+  class HigherOrderTerm extends @ql_higher_order_term, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HigherOrderTerm" }
 
     /** Gets the node corresponding to the field `name`. */
-    final LiteralId getName() { ql_higher_order_term_def(this, result) }
+    final F::LiteralId getName() { ql_higher_order_term_def(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_higher_order_term_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_higher_order_term_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_higher_order_term_def(this, result) or ql_higher_order_term_child(this, _, result)
     }
   }
 
   /** A class representing `if_term` nodes. */
-  final class IfTerm extends @ql_if_term, AstNodeImpl {
+  class IfTerm extends @ql_if_term, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "IfTerm" }
 
     /** Gets the node corresponding to the field `cond`. */
-    final AstNode getCond() { ql_if_term_def(this, result, _, _) }
+    final F::AstNode getCond() { ql_if_term_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `first`. */
-    final AstNode getFirst() { ql_if_term_def(this, _, result, _) }
+    final F::AstNode getFirst() { ql_if_term_def(this, _, result, _) }
 
     /** Gets the node corresponding to the field `second`. */
-    final AstNode getSecond() { ql_if_term_def(this, _, _, result) }
+    final F::AstNode getSecond() { ql_if_term_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_if_term_def(this, result, _, _) or
       ql_if_term_def(this, _, result, _) or
       ql_if_term_def(this, _, _, result)
@@ -612,126 +657,138 @@ module QL {
   }
 
   /** A class representing `implication` nodes. */
-  final class Implication extends @ql_implication, AstNodeImpl {
+  class Implication extends @ql_implication, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Implication" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ql_implication_def(this, result, _) }
+    final F::AstNode getLeft() { ql_implication_def(this, result, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ql_implication_def(this, _, result) }
+    final F::AstNode getRight() { ql_implication_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_implication_def(this, result, _) or ql_implication_def(this, _, result)
     }
   }
 
   /** A class representing `importDirective` nodes. */
-  final class ImportDirective extends @ql_import_directive, AstNodeImpl {
+  class ImportDirective extends @ql_import_directive, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ImportDirective" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_import_directive_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_import_directive_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_import_directive_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_import_directive_child(this, _, result) }
   }
 
   /** A class representing `importModuleExpr` nodes. */
-  final class ImportModuleExpr extends @ql_import_module_expr, AstNodeImpl {
+  class ImportModuleExpr extends @ql_import_module_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ImportModuleExpr" }
 
     /** Gets the node corresponding to the field `qualName`. */
-    final SimpleId getQualName(int i) { ql_import_module_expr_qual_name(this, i, result) }
+    final F::SimpleId getQualName(int i) { ql_import_module_expr_qual_name(this, i, result) }
+
+    /** Gets the node corresponding to the field `qualName`. */
+    final F::SimpleId getAQualName() { result = this.getQualName(_) }
 
     /** Gets the child of this node. */
-    final ModuleExpr getChild() { ql_import_module_expr_def(this, result) }
+    final F::ModuleExpr getChild() { ql_import_module_expr_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_import_module_expr_qual_name(this, _, result) or ql_import_module_expr_def(this, result)
     }
   }
 
   /** A class representing `in_expr` nodes. */
-  final class InExpr extends @ql_in_expr, AstNodeImpl {
+  class InExpr extends @ql_in_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "InExpr" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ql_in_expr_def(this, result, _) }
+    final F::AstNode getLeft() { ql_in_expr_def(this, result, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ql_in_expr_def(this, _, result) }
+    final F::AstNode getRight() { ql_in_expr_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_in_expr_def(this, result, _) or ql_in_expr_def(this, _, result)
     }
   }
 
   /** A class representing `instance_of` nodes. */
-  final class InstanceOf extends @ql_instance_of, AstNodeImpl {
+  class InstanceOf extends @ql_instance_of, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "InstanceOf" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_instance_of_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_instance_of_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_instance_of_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_instance_of_child(this, _, result) }
   }
 
   /** A class representing `integer` tokens. */
-  final class Integer extends @ql_token_integer, TokenImpl {
+  class Integer extends @ql_token_integer, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Integer" }
   }
 
   /** A class representing `line_comment` tokens. */
-  final class LineComment extends @ql_token_line_comment, TokenImpl {
+  class LineComment extends @ql_token_line_comment, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "LineComment" }
   }
 
   /** A class representing `literal` nodes. */
-  final class Literal extends @ql_literal, AstNodeImpl {
+  class Literal extends @ql_literal, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Literal" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_literal_def(this, result) }
+    final F::AstNode getChild() { ql_literal_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_literal_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_literal_def(this, result) }
   }
 
   /** A class representing `literalId` tokens. */
-  final class LiteralId extends @ql_token_literal_id, TokenImpl {
+  class LiteralId extends @ql_token_literal_id, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "LiteralId" }
   }
 
   /** A class representing `memberPredicate` nodes. */
-  final class MemberPredicate extends @ql_member_predicate, AstNodeImpl {
+  class MemberPredicate extends @ql_member_predicate, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "MemberPredicate" }
 
     /** Gets the node corresponding to the field `name`. */
-    final PredicateName getName() { ql_member_predicate_def(this, result, _) }
+    final F::PredicateName getName() { ql_member_predicate_def(this, result, _) }
 
     /** Gets the node corresponding to the field `returnType`. */
-    final AstNode getReturnType() { ql_member_predicate_def(this, _, result) }
+    final F::AstNode getReturnType() { ql_member_predicate_def(this, _, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getChild(int i) { ql_member_predicate_child(this, i, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_member_predicate_child(this, i, result) }
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_member_predicate_def(this, result, _) or
       ql_member_predicate_def(this, _, result) or
       ql_member_predicate_child(this, _, result)
@@ -739,24 +796,33 @@ module QL {
   }
 
   /** A class representing `module` nodes. */
-  final class Module extends @ql_module, AstNodeImpl {
+  class Module extends @ql_module, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Module" }
 
     /** Gets the node corresponding to the field `implements`. */
-    final SignatureExpr getImplements(int i) { ql_module_implements(this, i, result) }
+    final F::SignatureExpr getImplements(int i) { ql_module_implements(this, i, result) }
+
+    /** Gets the node corresponding to the field `implements`. */
+    final F::SignatureExpr getAnImplements() { result = this.getImplements(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final ModuleName getName() { ql_module_def(this, result) }
+    final F::ModuleName getName() { ql_module_def(this, result) }
+
+    /** Gets the node corresponding to the field `parameter`. */
+    final F::ModuleParam getParameter(int i) { ql_module_parameter(this, i, result) }
 
     /** Gets the node corresponding to the field `parameter`. */
-    final ModuleParam getParameter(int i) { ql_module_parameter(this, i, result) }
+    final F::ModuleParam getAParameter() { result = this.getParameter(_) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_module_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_module_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_module_implements(this, _, result) or
       ql_module_def(this, result) or
       ql_module_parameter(this, _, result) or
@@ -765,108 +831,114 @@ module QL {
   }
 
   /** A class representing `moduleAliasBody` nodes. */
-  final class ModuleAliasBody extends @ql_module_alias_body, AstNodeImpl {
+  class ModuleAliasBody extends @ql_module_alias_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ModuleAliasBody" }
 
     /** Gets the child of this node. */
-    final ModuleExpr getChild() { ql_module_alias_body_def(this, result) }
+    final F::ModuleExpr getChild() { ql_module_alias_body_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_module_alias_body_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_module_alias_body_def(this, result) }
   }
 
   /** A class representing `moduleExpr` nodes. */
-  final class ModuleExpr extends @ql_module_expr, AstNodeImpl {
+  class ModuleExpr extends @ql_module_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ModuleExpr" }
 
     /** Gets the node corresponding to the field `name`. */
-    final AstNode getName() { ql_module_expr_name(this, result) }
+    final F::AstNode getName() { ql_module_expr_name(this, result) }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_module_expr_def(this, result) }
+    final F::AstNode getChild() { ql_module_expr_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_module_expr_name(this, result) or ql_module_expr_def(this, result)
     }
   }
 
   /** A class representing `moduleInstantiation` nodes. */
-  final class ModuleInstantiation extends @ql_module_instantiation, AstNodeImpl {
+  class ModuleInstantiation extends @ql_module_instantiation, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ModuleInstantiation" }
 
     /** Gets the node corresponding to the field `name`. */
-    final ModuleName getName() { ql_module_instantiation_def(this, result) }
+    final F::ModuleName getName() { ql_module_instantiation_def(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final SignatureExpr getChild(int i) { ql_module_instantiation_child(this, i, result) }
+    final F::SignatureExpr getChild(int i) { ql_module_instantiation_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::SignatureExpr getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_module_instantiation_def(this, result) or ql_module_instantiation_child(this, _, result)
     }
   }
 
   /** A class representing `moduleMember` nodes. */
-  final class ModuleMember extends @ql_module_member, AstNodeImpl {
+  class ModuleMember extends @ql_module_member, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ModuleMember" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_module_member_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_module_member_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_module_member_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_module_member_child(this, _, result) }
   }
 
   /** A class representing `moduleName` nodes. */
-  final class ModuleName extends @ql_module_name, AstNodeImpl {
+  class ModuleName extends @ql_module_name, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ModuleName" }
 
     /** Gets the child of this node. */
-    final SimpleId getChild() { ql_module_name_def(this, result) }
+    final F::SimpleId getChild() { ql_module_name_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_module_name_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_module_name_def(this, result) }
   }
 
   /** A class representing `moduleParam` nodes. */
-  final class ModuleParam extends @ql_module_param, AstNodeImpl {
+  class ModuleParam extends @ql_module_param, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ModuleParam" }
 
     /** Gets the node corresponding to the field `parameter`. */
-    final SimpleId getParameter() { ql_module_param_def(this, result, _) }
+    final F::SimpleId getParameter() { ql_module_param_def(this, result, _) }
 
     /** Gets the node corresponding to the field `signature`. */
-    final SignatureExpr getSignature() { ql_module_param_def(this, _, result) }
+    final F::SignatureExpr getSignature() { ql_module_param_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_module_param_def(this, result, _) or ql_module_param_def(this, _, result)
     }
   }
 
   /** A class representing `mul_expr` nodes. */
-  final class MulExpr extends @ql_mul_expr, AstNodeImpl {
+  class MulExpr extends @ql_mul_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "MulExpr" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ql_mul_expr_def(this, result, _, _) }
+    final F::AstNode getLeft() { ql_mul_expr_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ql_mul_expr_def(this, _, result, _) }
+    final F::AstNode getRight() { ql_mul_expr_def(this, _, result, _) }
 
     /** Gets the child of this node. */
-    final Mulop getChild() { ql_mul_expr_def(this, _, _, result) }
+    final F::Mulop getChild() { ql_mul_expr_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_mul_expr_def(this, result, _, _) or
       ql_mul_expr_def(this, _, result, _) or
       ql_mul_expr_def(this, _, _, result)
@@ -874,179 +946,203 @@ module QL {
   }
 
   /** A class representing `mulop` tokens. */
-  final class Mulop extends @ql_token_mulop, TokenImpl {
+  class Mulop extends @ql_token_mulop, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Mulop" }
   }
 
   /** A class representing `negation` nodes. */
-  final class Negation extends @ql_negation, AstNodeImpl {
+  class Negation extends @ql_negation, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Negation" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_negation_def(this, result) }
+    final F::AstNode getChild() { ql_negation_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_negation_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_negation_def(this, result) }
   }
 
   /** A class representing `orderBy` nodes. */
-  final class OrderBy extends @ql_order_by, AstNodeImpl {
+  class OrderBy extends @ql_order_by, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "OrderBy" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_order_by_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_order_by_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_order_by_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_order_by_child(this, _, result) }
   }
 
   /** A class representing `orderBys` nodes. */
-  final class OrderBys extends @ql_order_bys, AstNodeImpl {
+  class OrderBys extends @ql_order_bys, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "OrderBys" }
 
     /** Gets the `i`th child of this node. */
-    final OrderBy getChild(int i) { ql_order_bys_child(this, i, result) }
+    final F::OrderBy getChild(int i) { ql_order_bys_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::OrderBy getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_order_bys_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_order_bys_child(this, _, result) }
   }
 
   /** A class representing `par_expr` nodes. */
-  final class ParExpr extends @ql_par_expr, AstNodeImpl {
+  class ParExpr extends @ql_par_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ParExpr" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_par_expr_def(this, result) }
+    final F::AstNode getChild() { ql_par_expr_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_par_expr_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_par_expr_def(this, result) }
   }
 
   /** A class representing `predicate` tokens. */
-  final class Predicate extends @ql_token_predicate, TokenImpl {
+  class Predicate extends @ql_token_predicate, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Predicate" }
   }
 
   /** A class representing `predicateAliasBody` nodes. */
-  final class PredicateAliasBody extends @ql_predicate_alias_body, AstNodeImpl {
+  class PredicateAliasBody extends @ql_predicate_alias_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PredicateAliasBody" }
 
     /** Gets the child of this node. */
-    final PredicateExpr getChild() { ql_predicate_alias_body_def(this, result) }
+    final F::PredicateExpr getChild() { ql_predicate_alias_body_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_predicate_alias_body_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_predicate_alias_body_def(this, result) }
   }
 
   /** A class representing `predicateExpr` nodes. */
-  final class PredicateExpr extends @ql_predicate_expr, AstNodeImpl {
+  class PredicateExpr extends @ql_predicate_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PredicateExpr" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_predicate_expr_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_predicate_expr_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_predicate_expr_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_predicate_expr_child(this, _, result) }
   }
 
   /** A class representing `predicateName` tokens. */
-  final class PredicateName extends @ql_token_predicate_name, TokenImpl {
+  class PredicateName extends @ql_token_predicate_name, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PredicateName" }
   }
 
   /** A class representing `prefix_cast` nodes. */
-  final class PrefixCast extends @ql_prefix_cast, AstNodeImpl {
+  class PrefixCast extends @ql_prefix_cast, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PrefixCast" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_prefix_cast_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_prefix_cast_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_prefix_cast_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_prefix_cast_child(this, _, result) }
   }
 
   /** A class representing `primitiveType` tokens. */
-  final class PrimitiveType extends @ql_token_primitive_type, TokenImpl {
+  class PrimitiveType extends @ql_token_primitive_type, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PrimitiveType" }
   }
 
   /** A class representing `ql` nodes. */
-  final class Ql extends @ql_ql, AstNodeImpl {
+  class Ql extends @ql_ql, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Ql" }
 
     /** Gets the `i`th child of this node. */
-    final ModuleMember getChild(int i) { ql_ql_child(this, i, result) }
+    final F::ModuleMember getChild(int i) { ql_ql_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::ModuleMember getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_ql_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_ql_child(this, _, result) }
   }
 
   /** A class representing `qldoc` tokens. */
-  final class Qldoc extends @ql_token_qldoc, TokenImpl {
+  class Qldoc extends @ql_token_qldoc, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Qldoc" }
   }
 
   /** A class representing `qualifiedRhs` nodes. */
-  final class QualifiedRhs extends @ql_qualified_rhs, AstNodeImpl {
+  class QualifiedRhs extends @ql_qualified_rhs, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "QualifiedRhs" }
 
     /** Gets the node corresponding to the field `name`. */
-    final PredicateName getName() { ql_qualified_rhs_name(this, result) }
+    final F::PredicateName getName() { ql_qualified_rhs_name(this, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getChild(int i) { ql_qualified_rhs_child(this, i, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_qualified_rhs_child(this, i, result) }
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_qualified_rhs_name(this, result) or ql_qualified_rhs_child(this, _, result)
     }
   }
 
   /** A class representing `qualified_expr` nodes. */
-  final class QualifiedExpr extends @ql_qualified_expr, AstNodeImpl {
+  class QualifiedExpr extends @ql_qualified_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "QualifiedExpr" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_qualified_expr_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_qualified_expr_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_qualified_expr_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_qualified_expr_child(this, _, result) }
   }
 
   /** A class representing `quantified` nodes. */
-  final class Quantified extends @ql_quantified, AstNodeImpl {
+  class Quantified extends @ql_quantified, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Quantified" }
 
     /** Gets the node corresponding to the field `expr`. */
-    final AstNode getExpr() { ql_quantified_expr(this, result) }
+    final F::AstNode getExpr() { ql_quantified_expr(this, result) }
 
     /** Gets the node corresponding to the field `formula`. */
-    final AstNode getFormula() { ql_quantified_formula(this, result) }
+    final F::AstNode getFormula() { ql_quantified_formula(this, result) }
 
     /** Gets the node corresponding to the field `range`. */
-    final AstNode getRange() { ql_quantified_range(this, result) }
+    final F::AstNode getRange() { ql_quantified_range(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_quantified_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_quantified_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_quantified_expr(this, result) or
       ql_quantified_formula(this, result) or
       ql_quantified_range(this, result) or
@@ -1055,74 +1151,80 @@ module QL {
   }
 
   /** A class representing `quantifier` tokens. */
-  final class Quantifier extends @ql_token_quantifier, TokenImpl {
+  class Quantifier extends @ql_token_quantifier, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Quantifier" }
   }
 
   /** A class representing `range` nodes. */
-  final class Range extends @ql_range, AstNodeImpl {
+  class Range extends @ql_range, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Range" }
 
     /** Gets the node corresponding to the field `lower`. */
-    final AstNode getLower() { ql_range_def(this, result, _) }
+    final F::AstNode getLower() { ql_range_def(this, result, _) }
 
     /** Gets the node corresponding to the field `upper`. */
-    final AstNode getUpper() { ql_range_def(this, _, result) }
+    final F::AstNode getUpper() { ql_range_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_range_def(this, result, _) or ql_range_def(this, _, result)
     }
   }
 
   /** A class representing `result` tokens. */
-  final class Result extends @ql_token_result, TokenImpl {
+  class Result extends @ql_token_result, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Result" }
   }
 
   /** A class representing `select` nodes. */
-  final class Select extends @ql_select, AstNodeImpl {
+  class Select extends @ql_select, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Select" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_select_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_select_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_select_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_select_child(this, _, result) }
   }
 
   /** A class representing `set_literal` nodes. */
-  final class SetLiteral extends @ql_set_literal, AstNodeImpl {
+  class SetLiteral extends @ql_set_literal, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SetLiteral" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_set_literal_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_set_literal_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_set_literal_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_set_literal_child(this, _, result) }
   }
 
   /** A class representing `signatureExpr` nodes. */
-  final class SignatureExpr extends @ql_signature_expr, AstNodeImpl {
+  class SignatureExpr extends @ql_signature_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SignatureExpr" }
 
     /** Gets the node corresponding to the field `mod_expr`. */
-    final ModuleExpr getModExpr() { ql_signature_expr_mod_expr(this, result) }
+    final F::ModuleExpr getModExpr() { ql_signature_expr_mod_expr(this, result) }
 
     /** Gets the node corresponding to the field `predicate`. */
-    final PredicateExpr getPredicate() { ql_signature_expr_predicate(this, result) }
+    final F::PredicateExpr getPredicate() { ql_signature_expr_predicate(this, result) }
 
     /** Gets the node corresponding to the field `type_expr`. */
-    final TypeExpr getTypeExpr() { ql_signature_expr_type_expr(this, result) }
+    final F::TypeExpr getTypeExpr() { ql_signature_expr_type_expr(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_signature_expr_mod_expr(this, result) or
       ql_signature_expr_predicate(this, result) or
       ql_signature_expr_type_expr(this, result)
@@ -1130,93 +1232,96 @@ module QL {
   }
 
   /** A class representing `simpleId` tokens. */
-  final class SimpleId extends @ql_token_simple_id, TokenImpl {
+  class SimpleId extends @ql_token_simple_id, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SimpleId" }
   }
 
   /** A class representing `specialId` tokens. */
-  final class SpecialId extends @ql_token_special_id, TokenImpl {
+  class SpecialId extends @ql_token_special_id, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SpecialId" }
   }
 
   /** A class representing `special_call` nodes. */
-  final class SpecialCall extends @ql_special_call, AstNodeImpl {
+  class SpecialCall extends @ql_special_call, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SpecialCall" }
 
     /** Gets the child of this node. */
-    final SpecialId getChild() { ql_special_call_def(this, result) }
+    final F::SpecialId getChild() { ql_special_call_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_special_call_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_special_call_def(this, result) }
   }
 
   /** A class representing `string` tokens. */
-  final class String extends @ql_token_string, TokenImpl {
+  class String extends @ql_token_string, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "String" }
   }
 
   /** A class representing `super` tokens. */
-  final class Super extends @ql_token_super, TokenImpl {
+  class Super extends @ql_token_super, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Super" }
   }
 
   /** A class representing `super_ref` nodes. */
-  final class SuperRef extends @ql_super_ref, AstNodeImpl {
+  class SuperRef extends @ql_super_ref, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SuperRef" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_super_ref_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_super_ref_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_super_ref_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_super_ref_child(this, _, result) }
   }
 
   /** A class representing `this` tokens. */
-  final class This extends @ql_token_this, TokenImpl {
+  class This extends @ql_token_this, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "This" }
   }
 
   /** A class representing `true` tokens. */
-  final class True extends @ql_token_true, TokenImpl {
+  class True extends @ql_token_true, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "True" }
   }
 
   /** A class representing `typeAliasBody` nodes. */
-  final class TypeAliasBody extends @ql_type_alias_body, AstNodeImpl {
+  class TypeAliasBody extends @ql_type_alias_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TypeAliasBody" }
 
     /** Gets the child of this node. */
-    final TypeExpr getChild() { ql_type_alias_body_def(this, result) }
+    final F::TypeExpr getChild() { ql_type_alias_body_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_type_alias_body_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_type_alias_body_def(this, result) }
   }
 
   /** A class representing `typeExpr` nodes. */
-  final class TypeExpr extends @ql_type_expr, AstNodeImpl {
+  class TypeExpr extends @ql_type_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TypeExpr" }
 
     /** Gets the node corresponding to the field `name`. */
-    final ClassName getName() { ql_type_expr_name(this, result) }
+    final F::ClassName getName() { ql_type_expr_name(this, result) }
 
     /** Gets the node corresponding to the field `qualifier`. */
-    final ModuleExpr getQualifier() { ql_type_expr_qualifier(this, result) }
+    final F::ModuleExpr getQualifier() { ql_type_expr_qualifier(this, result) }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_type_expr_child(this, result) }
+    final F::AstNode getChild() { ql_type_expr_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_type_expr_name(this, result) or
       ql_type_expr_qualifier(this, result) or
       ql_type_expr_child(this, result)
@@ -1224,57 +1329,69 @@ module QL {
   }
 
   /** A class representing `typeUnionBody` nodes. */
-  final class TypeUnionBody extends @ql_type_union_body, AstNodeImpl {
+  class TypeUnionBody extends @ql_type_union_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TypeUnionBody" }
 
     /** Gets the `i`th child of this node. */
-    final TypeExpr getChild(int i) { ql_type_union_body_child(this, i, result) }
+    final F::TypeExpr getChild(int i) { ql_type_union_body_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::TypeExpr getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_type_union_body_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_type_union_body_child(this, _, result) }
   }
 
   /** A class representing `unary_expr` nodes. */
-  final class UnaryExpr extends @ql_unary_expr, AstNodeImpl {
+  class UnaryExpr extends @ql_unary_expr, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UnaryExpr" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_unary_expr_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_unary_expr_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_unary_expr_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_unary_expr_child(this, _, result) }
   }
 
   /** A class representing `underscore` tokens. */
-  final class Underscore extends @ql_token_underscore, TokenImpl {
+  class Underscore extends @ql_token_underscore, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Underscore" }
   }
 
   /** A class representing `unop` tokens. */
-  final class Unop extends @ql_token_unop, TokenImpl {
+  class Unop extends @ql_token_unop, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Unop" }
   }
 
   /** A class representing `unqual_agg_body` nodes. */
-  final class UnqualAggBody extends @ql_unqual_agg_body, AstNodeImpl {
+  class UnqualAggBody extends @ql_unqual_agg_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UnqualAggBody" }
 
     /** Gets the node corresponding to the field `asExprs`. */
-    final AstNode getAsExprs(int i) { ql_unqual_agg_body_as_exprs(this, i, result) }
+    final F::AstNode getAsExprs(int i) { ql_unqual_agg_body_as_exprs(this, i, result) }
+
+    /** Gets the node corresponding to the field `asExprs`. */
+    final F::AstNode getAnAsExprs() { result = this.getAsExprs(_) }
 
     /** Gets the node corresponding to the field `guard`. */
-    final AstNode getGuard() { ql_unqual_agg_body_guard(this, result) }
+    final F::AstNode getGuard() { ql_unqual_agg_body_guard(this, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::VarDecl getChild(int i) { ql_unqual_agg_body_child(this, i, result) }
 
     /** Gets the `i`th child of this node. */
-    final VarDecl getChild(int i) { ql_unqual_agg_body_child(this, i, result) }
+    final F::VarDecl getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ql_unqual_agg_body_as_exprs(this, _, result) or
       ql_unqual_agg_body_guard(this, result) or
       ql_unqual_agg_body_child(this, _, result)
@@ -1282,45 +1399,48 @@ module QL {
   }
 
   /** A class representing `varDecl` nodes. */
-  final class VarDecl extends @ql_var_decl, AstNodeImpl {
+  class VarDecl extends @ql_var_decl, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "VarDecl" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ql_var_decl_child(this, i, result) }
+    final F::AstNode getChild(int i) { ql_var_decl_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_var_decl_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ql_var_decl_child(this, _, result) }
   }
 
   /** A class representing `varName` nodes. */
-  final class VarName extends @ql_var_name, AstNodeImpl {
+  class VarName extends @ql_var_name, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "VarName" }
 
     /** Gets the child of this node. */
-    final SimpleId getChild() { ql_var_name_def(this, result) }
+    final F::SimpleId getChild() { ql_var_name_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_var_name_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_var_name_def(this, result) }
   }
 
   /** A class representing `variable` nodes. */
-  final class Variable extends @ql_variable, AstNodeImpl {
+  class Variable extends @ql_variable, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Variable" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ql_variable_def(this, result) }
+    final F::AstNode getChild() { ql_variable_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ql_variable_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ql_variable_def(this, result) }
   }
 
   /** Provides predicates for mapping AST nodes to their named children. */
   module PrintAst {
     /** Gets a child of `node` returned by the member predicate with the given `name`. If the predicate takes an index argument, `i` is bound to that index, otherwise `i` is `-1` (which is never a valid index). */
-    AstNode getChild(AstNode node, string name, int i) {
+    F::AstNode getChild(F::AstNode node, string name, int i) {
       result = node.(AddExpr).getLeft() and i = -1 and name = "getLeft"
       or
       result = node.(AddExpr).getRight() and i = -1 and name = "getRight"
@@ -1556,10 +1676,218 @@ module QL {
   }
 }
 
+module QLFinal {
+  private module F = QL;
+
+  import F
+
+  final class AstNode = F::AstNode;
+
+  final class Token = F::Token;
+
+  final class ReservedWord = F::ReservedWord;
+
+  final class AddExpr = F::AddExpr;
+
+  final class Addop = F::Addop;
+
+  final class AggId = F::AggId;
+
+  final class Aggregate = F::Aggregate;
+
+  final class AnnotArg = F::AnnotArg;
+
+  final class AnnotName = F::AnnotName;
+
+  final class Annotation = F::Annotation;
+
+  final class AritylessPredicateExpr = F::AritylessPredicateExpr;
+
+  final class AsExpr = F::AsExpr;
+
+  final class AsExprs = F::AsExprs;
+
+  final class BlockComment = F::BlockComment;
+
+  final class Body = F::Body;
+
+  final class Bool = F::Bool;
+
+  final class CallBody = F::CallBody;
+
+  final class CallOrUnqualAggExpr = F::CallOrUnqualAggExpr;
+
+  final class Charpred = F::Charpred;
+
+  final class ClassMember = F::ClassMember;
+
+  final class ClassName = F::ClassName;
+
+  final class ClasslessPredicate = F::ClasslessPredicate;
+
+  final class Closure = F::Closure;
+
+  final class CompTerm = F::CompTerm;
+
+  final class Compop = F::Compop;
+
+  final class Conjunction = F::Conjunction;
+
+  final class Dataclass = F::Dataclass;
+
+  final class Datatype = F::Datatype;
+
+  final class DatatypeBranch = F::DatatypeBranch;
+
+  final class DatatypeBranches = F::DatatypeBranches;
+
+  final class Dbtype = F::Dbtype;
+
+  final class Direction = F::Direction;
+
+  final class Disjunction = F::Disjunction;
+
+  final class Empty = F::Empty;
+
+  final class ExprAggregateBody = F::ExprAggregateBody;
+
+  final class ExprAnnotation = F::ExprAnnotation;
+
+  final class False = F::False;
+
+  final class Field = F::Field;
+
+  final class Float = F::Float;
+
+  final class FullAggregateBody = F::FullAggregateBody;
+
+  final class HigherOrderTerm = F::HigherOrderTerm;
+
+  final class IfTerm = F::IfTerm;
+
+  final class Implication = F::Implication;
+
+  final class ImportDirective = F::ImportDirective;
+
+  final class ImportModuleExpr = F::ImportModuleExpr;
+
+  final class InExpr = F::InExpr;
+
+  final class InstanceOf = F::InstanceOf;
+
+  final class Integer = F::Integer;
+
+  final class LineComment = F::LineComment;
+
+  final class Literal = F::Literal;
+
+  final class LiteralId = F::LiteralId;
+
+  final class MemberPredicate = F::MemberPredicate;
+
+  final class Module = F::Module;
+
+  final class ModuleAliasBody = F::ModuleAliasBody;
+
+  final class ModuleExpr = F::ModuleExpr;
+
+  final class ModuleInstantiation = F::ModuleInstantiation;
+
+  final class ModuleMember = F::ModuleMember;
+
+  final class ModuleName = F::ModuleName;
+
+  final class ModuleParam = F::ModuleParam;
+
+  final class MulExpr = F::MulExpr;
+
+  final class Mulop = F::Mulop;
+
+  final class Negation = F::Negation;
+
+  final class OrderBy = F::OrderBy;
+
+  final class OrderBys = F::OrderBys;
+
+  final class ParExpr = F::ParExpr;
+
+  final class Predicate = F::Predicate;
+
+  final class PredicateAliasBody = F::PredicateAliasBody;
+
+  final class PredicateExpr = F::PredicateExpr;
+
+  final class PredicateName = F::PredicateName;
+
+  final class PrefixCast = F::PrefixCast;
+
+  final class PrimitiveType = F::PrimitiveType;
+
+  final class Ql = F::Ql;
+
+  final class Qldoc = F::Qldoc;
+
+  final class QualifiedRhs = F::QualifiedRhs;
+
+  final class QualifiedExpr = F::QualifiedExpr;
+
+  final class Quantified = F::Quantified;
+
+  final class Quantifier = F::Quantifier;
+
+  final class Range = F::Range;
+
+  final class Result = F::Result;
+
+  final class Select = F::Select;
+
+  final class SetLiteral = F::SetLiteral;
+
+  final class SignatureExpr = F::SignatureExpr;
+
+  final class SimpleId = F::SimpleId;
+
+  final class SpecialId = F::SpecialId;
+
+  final class SpecialCall = F::SpecialCall;
+
+  final class String = F::String;
+
+  final class Super = F::Super;
+
+  final class SuperRef = F::SuperRef;
+
+  final class This = F::This;
+
+  final class True = F::True;
+
+  final class TypeAliasBody = F::TypeAliasBody;
+
+  final class TypeExpr = F::TypeExpr;
+
+  final class TypeUnionBody = F::TypeUnionBody;
+
+  final class UnaryExpr = F::UnaryExpr;
+
+  final class Underscore = F::Underscore;
+
+  final class Unop = F::Unop;
+
+  final class UnqualAggBody = F::UnqualAggBody;
+
+  final class VarDecl = F::VarDecl;
+
+  final class VarName = F::VarName;
+
+  final class Variable = F::Variable;
+}
+
 overlay[local]
 module Dbscheme {
+  private module F = Dbscheme;
+
   /** The base class for all AST nodes */
-  private class AstNodeImpl extends @dbscheme_ast_node {
+  class AstNode extends @dbscheme_ast_node {
     /** Gets a string representation of this element. */
     string toString() { result = this.getAPrimaryQlClass() }
 
@@ -1567,13 +1895,13 @@ module Dbscheme {
     final L::Location getLocation() { dbscheme_ast_node_location(this, result) }
 
     /** Gets the parent of this element. */
-    final AstNode getParent() { dbscheme_ast_node_parent(this, result, _) }
+    final F::AstNode getParent() { dbscheme_ast_node_parent(this, result, _) }
 
     /** Gets the index of this node among the children of its parent. */
     final int getParentIndex() { dbscheme_ast_node_parent(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    AstNode getAFieldOrChild() { none() }
+    F::AstNode getAFieldOrChild() { none() }
 
     /** Gets the name of the primary QL class for this element. */
     string getAPrimaryQlClass() { result = "???" }
@@ -1582,10 +1910,8 @@ module Dbscheme {
     string getPrimaryQlClasses() { result = concat(this.getAPrimaryQlClass(), ",") }
   }
 
-  final class AstNode = AstNodeImpl;
-
   /** A token. */
-  private class TokenImpl extends @dbscheme_token, AstNodeImpl {
+  class Token extends @dbscheme_token, F::AstNode {
     /** Gets the value of this token. */
     final string getValue() { dbscheme_tokeninfo(this, _, result) }
 
@@ -1596,10 +1922,8 @@ module Dbscheme {
     override string getAPrimaryQlClass() { result = "Token" }
   }
 
-  final class Token = TokenImpl;
-
   /** A reserved word. */
-  final class ReservedWord extends @dbscheme_reserved_word, TokenImpl {
+  class ReservedWord extends @dbscheme_reserved_word, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ReservedWord" }
   }
@@ -1625,91 +1949,102 @@ module Dbscheme {
   }
 
   /** A class representing `annotName` tokens. */
-  final class AnnotName extends @dbscheme_token_annot_name, TokenImpl {
+  class AnnotName extends @dbscheme_token_annot_name, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AnnotName" }
   }
 
   /** A class representing `annotation` nodes. */
-  final class Annotation extends @dbscheme_annotation, AstNodeImpl {
+  class Annotation extends @dbscheme_annotation, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Annotation" }
 
     /** Gets the node corresponding to the field `argsAnnotation`. */
-    final ArgsAnnotation getArgsAnnotation() { dbscheme_annotation_args_annotation(this, result) }
+    final F::ArgsAnnotation getArgsAnnotation() {
+      dbscheme_annotation_args_annotation(this, result)
+    }
 
     /** Gets the node corresponding to the field `simpleAnnotation`. */
-    final AnnotName getSimpleAnnotation() { dbscheme_annotation_simple_annotation(this, result) }
+    final F::AnnotName getSimpleAnnotation() { dbscheme_annotation_simple_annotation(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       dbscheme_annotation_args_annotation(this, result) or
       dbscheme_annotation_simple_annotation(this, result)
     }
   }
 
   /** A class representing `argsAnnotation` nodes. */
-  final class ArgsAnnotation extends @dbscheme_args_annotation, AstNodeImpl {
+  class ArgsAnnotation extends @dbscheme_args_annotation, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ArgsAnnotation" }
 
     /** Gets the node corresponding to the field `name`. */
-    final AnnotName getName() { dbscheme_args_annotation_def(this, result) }
+    final F::AnnotName getName() { dbscheme_args_annotation_def(this, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::SimpleId getChild(int i) { dbscheme_args_annotation_child(this, i, result) }
 
     /** Gets the `i`th child of this node. */
-    final SimpleId getChild(int i) { dbscheme_args_annotation_child(this, i, result) }
+    final F::SimpleId getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       dbscheme_args_annotation_def(this, result) or dbscheme_args_annotation_child(this, _, result)
     }
   }
 
   /** A class representing `block_comment` tokens. */
-  final class BlockComment extends @dbscheme_token_block_comment, TokenImpl {
+  class BlockComment extends @dbscheme_token_block_comment, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BlockComment" }
   }
 
   /** A class representing `boolean` tokens. */
-  final class Boolean extends @dbscheme_token_boolean, TokenImpl {
+  class Boolean extends @dbscheme_token_boolean, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Boolean" }
   }
 
   /** A class representing `branch` nodes. */
-  final class Branch extends @dbscheme_branch, AstNodeImpl {
+  class Branch extends @dbscheme_branch, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Branch" }
 
     /** Gets the node corresponding to the field `qldoc`. */
-    final Qldoc getQldoc() { dbscheme_branch_qldoc(this, result) }
+    final F::Qldoc getQldoc() { dbscheme_branch_qldoc(this, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getChild(int i) { dbscheme_branch_child(this, i, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { dbscheme_branch_child(this, i, result) }
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       dbscheme_branch_qldoc(this, result) or dbscheme_branch_child(this, _, result)
     }
   }
 
   /** A class representing `caseDecl` nodes. */
-  final class CaseDecl extends @dbscheme_case_decl, AstNodeImpl {
+  class CaseDecl extends @dbscheme_case_decl, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CaseDecl" }
 
     /** Gets the node corresponding to the field `base`. */
-    final Dbtype getBase() { dbscheme_case_decl_def(this, result, _) }
+    final F::Dbtype getBase() { dbscheme_case_decl_def(this, result, _) }
 
     /** Gets the node corresponding to the field `discriminator`. */
-    final SimpleId getDiscriminator() { dbscheme_case_decl_def(this, _, result) }
+    final F::SimpleId getDiscriminator() { dbscheme_case_decl_def(this, _, result) }
 
     /** Gets the `i`th child of this node. */
-    final Branch getChild(int i) { dbscheme_case_decl_child(this, i, result) }
+    final F::Branch getChild(int i) { dbscheme_case_decl_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::Branch getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       dbscheme_case_decl_def(this, result, _) or
       dbscheme_case_decl_def(this, _, result) or
       dbscheme_case_decl_child(this, _, result)
@@ -1717,42 +2052,42 @@ module Dbscheme {
   }
 
   /** A class representing `colType` nodes. */
-  final class ColType extends @dbscheme_col_type, AstNodeImpl {
+  class ColType extends @dbscheme_col_type, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ColType" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { dbscheme_col_type_def(this, result) }
+    final F::AstNode getChild() { dbscheme_col_type_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { dbscheme_col_type_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { dbscheme_col_type_def(this, result) }
   }
 
   /** A class representing `column` nodes. */
-  final class Column extends @dbscheme_column, AstNodeImpl {
+  class Column extends @dbscheme_column, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Column" }
 
     /** Gets the node corresponding to the field `colName`. */
-    final SimpleId getColName() { dbscheme_column_def(this, result, _, _) }
+    final F::SimpleId getColName() { dbscheme_column_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `colType`. */
-    final ColType getColType() { dbscheme_column_def(this, _, result, _) }
+    final F::ColType getColType() { dbscheme_column_def(this, _, result, _) }
 
     /** Gets the node corresponding to the field `isRef`. */
-    final Ref getIsRef() { dbscheme_column_is_ref(this, result) }
+    final F::Ref getIsRef() { dbscheme_column_is_ref(this, result) }
 
     /** Gets the node corresponding to the field `isUnique`. */
-    final Unique getIsUnique() { dbscheme_column_is_unique(this, result) }
+    final F::Unique getIsUnique() { dbscheme_column_is_unique(this, result) }
 
     /** Gets the node corresponding to the field `qldoc`. */
-    final Qldoc getQldoc() { dbscheme_column_qldoc(this, result) }
+    final F::Qldoc getQldoc() { dbscheme_column_qldoc(this, result) }
 
     /** Gets the node corresponding to the field `reprType`. */
-    final ReprType getReprType() { dbscheme_column_def(this, _, _, result) }
+    final F::ReprType getReprType() { dbscheme_column_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       dbscheme_column_def(this, result, _, _) or
       dbscheme_column_def(this, _, result, _) or
       dbscheme_column_is_ref(this, result) or
@@ -1763,155 +2098,167 @@ module Dbscheme {
   }
 
   /** A class representing `date` tokens. */
-  final class Date extends @dbscheme_token_date, TokenImpl {
+  class Date extends @dbscheme_token_date, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Date" }
   }
 
   /** A class representing `dbscheme` nodes. */
-  final class Dbscheme extends @dbscheme_dbscheme, AstNodeImpl {
+  class Dbscheme extends @dbscheme_dbscheme, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Dbscheme" }
 
     /** Gets the `i`th child of this node. */
-    final Entry getChild(int i) { dbscheme_dbscheme_child(this, i, result) }
+    final F::Entry getChild(int i) { dbscheme_dbscheme_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::Entry getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { dbscheme_dbscheme_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { dbscheme_dbscheme_child(this, _, result) }
   }
 
   /** A class representing `dbtype` tokens. */
-  final class Dbtype extends @dbscheme_token_dbtype, TokenImpl {
+  class Dbtype extends @dbscheme_token_dbtype, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Dbtype" }
   }
 
   /** A class representing `entry` nodes. */
-  final class Entry extends @dbscheme_entry, AstNodeImpl {
+  class Entry extends @dbscheme_entry, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Entry" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { dbscheme_entry_def(this, result) }
+    final F::AstNode getChild() { dbscheme_entry_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { dbscheme_entry_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { dbscheme_entry_def(this, result) }
   }
 
   /** A class representing `float` tokens. */
-  final class Float extends @dbscheme_token_float, TokenImpl {
+  class Float extends @dbscheme_token_float, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Float" }
   }
 
   /** A class representing `int` tokens. */
-  final class Int extends @dbscheme_token_int, TokenImpl {
+  class Int extends @dbscheme_token_int, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Int" }
   }
 
   /** A class representing `integer` tokens. */
-  final class Integer extends @dbscheme_token_integer, TokenImpl {
+  class Integer extends @dbscheme_token_integer, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Integer" }
   }
 
   /** A class representing `line_comment` tokens. */
-  final class LineComment extends @dbscheme_token_line_comment, TokenImpl {
+  class LineComment extends @dbscheme_token_line_comment, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "LineComment" }
   }
 
   /** A class representing `qldoc` tokens. */
-  final class Qldoc extends @dbscheme_token_qldoc, TokenImpl {
+  class Qldoc extends @dbscheme_token_qldoc, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Qldoc" }
   }
 
   /** A class representing `ref` tokens. */
-  final class Ref extends @dbscheme_token_ref, TokenImpl {
+  class Ref extends @dbscheme_token_ref, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Ref" }
   }
 
   /** A class representing `reprType` nodes. */
-  final class ReprType extends @dbscheme_repr_type, AstNodeImpl {
+  class ReprType extends @dbscheme_repr_type, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ReprType" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { dbscheme_repr_type_child(this, i, result) }
+    final F::AstNode getChild(int i) { dbscheme_repr_type_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { dbscheme_repr_type_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { dbscheme_repr_type_child(this, _, result) }
   }
 
   /** A class representing `simpleId` tokens. */
-  final class SimpleId extends @dbscheme_token_simple_id, TokenImpl {
+  class SimpleId extends @dbscheme_token_simple_id, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SimpleId" }
   }
 
   /** A class representing `string` tokens. */
-  final class String extends @dbscheme_token_string, TokenImpl {
+  class String extends @dbscheme_token_string, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "String" }
   }
 
   /** A class representing `table` nodes. */
-  final class Table extends @dbscheme_table, AstNodeImpl {
+  class Table extends @dbscheme_table, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Table" }
 
     /** Gets the node corresponding to the field `tableName`. */
-    final TableName getTableName() { dbscheme_table_def(this, result) }
+    final F::TableName getTableName() { dbscheme_table_def(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { dbscheme_table_child(this, i, result) }
+    final F::AstNode getChild(int i) { dbscheme_table_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       dbscheme_table_def(this, result) or dbscheme_table_child(this, _, result)
     }
   }
 
   /** A class representing `tableName` nodes. */
-  final class TableName extends @dbscheme_table_name, AstNodeImpl {
+  class TableName extends @dbscheme_table_name, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TableName" }
 
     /** Gets the child of this node. */
-    final SimpleId getChild() { dbscheme_table_name_def(this, result) }
+    final F::SimpleId getChild() { dbscheme_table_name_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { dbscheme_table_name_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { dbscheme_table_name_def(this, result) }
   }
 
   /** A class representing `unionDecl` nodes. */
-  final class UnionDecl extends @dbscheme_union_decl, AstNodeImpl {
+  class UnionDecl extends @dbscheme_union_decl, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UnionDecl" }
 
     /** Gets the node corresponding to the field `base`. */
-    final Dbtype getBase() { dbscheme_union_decl_def(this, result) }
+    final F::Dbtype getBase() { dbscheme_union_decl_def(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final Dbtype getChild(int i) { dbscheme_union_decl_child(this, i, result) }
+    final F::Dbtype getChild(int i) { dbscheme_union_decl_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::Dbtype getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       dbscheme_union_decl_def(this, result) or dbscheme_union_decl_child(this, _, result)
     }
   }
 
   /** A class representing `unique` tokens. */
-  final class Unique extends @dbscheme_token_unique, TokenImpl {
+  class Unique extends @dbscheme_token_unique, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Unique" }
   }
 
   /** A class representing `varchar` tokens. */
-  final class Varchar extends @dbscheme_token_varchar, TokenImpl {
+  class Varchar extends @dbscheme_token_varchar, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Varchar" }
   }
@@ -1919,7 +2266,7 @@ module Dbscheme {
   /** Provides predicates for mapping AST nodes to their named children. */
   module PrintAst {
     /** Gets a child of `node` returned by the member predicate with the given `name`. If the predicate takes an index argument, `i` is bound to that index, otherwise `i` is `-1` (which is never a valid index). */
-    AstNode getChild(AstNode node, string name, int i) {
+    F::AstNode getChild(F::AstNode node, string name, int i) {
       result = node.(Annotation).getArgsAnnotation() and i = -1 and name = "getArgsAnnotation"
       or
       result = node.(Annotation).getSimpleAnnotation() and i = -1 and name = "getSimpleAnnotation"
@@ -1971,10 +2318,78 @@ module Dbscheme {
   }
 }
 
+module DbschemeFinal {
+  private module F = Dbscheme;
+
+  import F
+
+  final class AstNode = F::AstNode;
+
+  final class Token = F::Token;
+
+  final class ReservedWord = F::ReservedWord;
+
+  final class AnnotName = F::AnnotName;
+
+  final class Annotation = F::Annotation;
+
+  final class ArgsAnnotation = F::ArgsAnnotation;
+
+  final class BlockComment = F::BlockComment;
+
+  final class Boolean = F::Boolean;
+
+  final class Branch = F::Branch;
+
+  final class CaseDecl = F::CaseDecl;
+
+  final class ColType = F::ColType;
+
+  final class Column = F::Column;
+
+  final class Date = F::Date;
+
+  final class Dbscheme = F::Dbscheme;
+
+  final class Dbtype = F::Dbtype;
+
+  final class Entry = F::Entry;
+
+  final class Float = F::Float;
+
+  final class Int = F::Int;
+
+  final class Integer = F::Integer;
+
+  final class LineComment = F::LineComment;
+
+  final class Qldoc = F::Qldoc;
+
+  final class Ref = F::Ref;
+
+  final class ReprType = F::ReprType;
+
+  final class SimpleId = F::SimpleId;
+
+  final class String = F::String;
+
+  final class Table = F::Table;
+
+  final class TableName = F::TableName;
+
+  final class UnionDecl = F::UnionDecl;
+
+  final class Unique = F::Unique;
+
+  final class Varchar = F::Varchar;
+}
+
 overlay[local]
 module Blame {
+  private module F = Blame;
+
   /** The base class for all AST nodes */
-  private class AstNodeImpl extends @blame_ast_node {
+  class AstNode extends @blame_ast_node {
     /** Gets a string representation of this element. */
     string toString() { result = this.getAPrimaryQlClass() }
 
@@ -1982,13 +2397,13 @@ module Blame {
     final L::Location getLocation() { blame_ast_node_location(this, result) }
 
     /** Gets the parent of this element. */
-    final AstNode getParent() { blame_ast_node_parent(this, result, _) }
+    final F::AstNode getParent() { blame_ast_node_parent(this, result, _) }
 
     /** Gets the index of this node among the children of its parent. */
     final int getParentIndex() { blame_ast_node_parent(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    AstNode getAFieldOrChild() { none() }
+    F::AstNode getAFieldOrChild() { none() }
 
     /** Gets the name of the primary QL class for this element. */
     string getAPrimaryQlClass() { result = "???" }
@@ -1997,10 +2412,8 @@ module Blame {
     string getPrimaryQlClasses() { result = concat(this.getAPrimaryQlClass(), ",") }
   }
 
-  final class AstNode = AstNodeImpl;
-
   /** A token. */
-  private class TokenImpl extends @blame_token, AstNodeImpl {
+  class Token extends @blame_token, F::AstNode {
     /** Gets the value of this token. */
     final string getValue() { blame_tokeninfo(this, _, result) }
 
@@ -2011,10 +2424,8 @@ module Blame {
     override string getAPrimaryQlClass() { result = "Token" }
   }
 
-  final class Token = TokenImpl;
-
   /** A reserved word. */
-  final class ReservedWord extends @blame_reserved_word, TokenImpl {
+  class ReservedWord extends @blame_reserved_word, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ReservedWord" }
   }
@@ -2040,70 +2451,79 @@ module Blame {
   }
 
   /** A class representing `blame_entry` nodes. */
-  final class BlameEntry extends @blame_blame_entry, AstNodeImpl {
+  class BlameEntry extends @blame_blame_entry, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BlameEntry" }
 
     /** Gets the node corresponding to the field `date`. */
-    final Date getDate() { blame_blame_entry_def(this, result) }
+    final F::Date getDate() { blame_blame_entry_def(this, result) }
+
+    /** Gets the node corresponding to the field `line`. */
+    final F::Number getLine(int i) { blame_blame_entry_line(this, i, result) }
 
     /** Gets the node corresponding to the field `line`. */
-    final Number getLine(int i) { blame_blame_entry_line(this, i, result) }
+    final F::Number getALine() { result = this.getLine(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       blame_blame_entry_def(this, result) or blame_blame_entry_line(this, _, result)
     }
   }
 
   /** A class representing `blame_info` nodes. */
-  final class BlameInfo extends @blame_blame_info, AstNodeImpl {
+  class BlameInfo extends @blame_blame_info, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BlameInfo" }
 
     /** Gets the node corresponding to the field `file_entry`. */
-    final FileEntry getFileEntry(int i) { blame_blame_info_file_entry(this, i, result) }
+    final F::FileEntry getFileEntry(int i) { blame_blame_info_file_entry(this, i, result) }
+
+    /** Gets the node corresponding to the field `file_entry`. */
+    final F::FileEntry getAFileEntry() { result = this.getFileEntry(_) }
 
     /** Gets the node corresponding to the field `today`. */
-    final Date getToday() { blame_blame_info_def(this, result) }
+    final F::Date getToday() { blame_blame_info_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       blame_blame_info_file_entry(this, _, result) or blame_blame_info_def(this, result)
     }
   }
 
   /** A class representing `date` tokens. */
-  final class Date extends @blame_token_date, TokenImpl {
+  class Date extends @blame_token_date, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Date" }
   }
 
   /** A class representing `file_entry` nodes. */
-  final class FileEntry extends @blame_file_entry, AstNodeImpl {
+  class FileEntry extends @blame_file_entry, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "FileEntry" }
 
     /** Gets the node corresponding to the field `blame_entry`. */
-    final BlameEntry getBlameEntry(int i) { blame_file_entry_blame_entry(this, i, result) }
+    final F::BlameEntry getBlameEntry(int i) { blame_file_entry_blame_entry(this, i, result) }
+
+    /** Gets the node corresponding to the field `blame_entry`. */
+    final F::BlameEntry getABlameEntry() { result = this.getBlameEntry(_) }
 
     /** Gets the node corresponding to the field `file_name`. */
-    final Filename getFileName() { blame_file_entry_def(this, result) }
+    final F::Filename getFileName() { blame_file_entry_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       blame_file_entry_blame_entry(this, _, result) or blame_file_entry_def(this, result)
     }
   }
 
   /** A class representing `filename` tokens. */
-  final class Filename extends @blame_token_filename, TokenImpl {
+  class Filename extends @blame_token_filename, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Filename" }
   }
 
   /** A class representing `number` tokens. */
-  final class Number extends @blame_token_number, TokenImpl {
+  class Number extends @blame_token_number, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Number" }
   }
@@ -2111,7 +2531,7 @@ module Blame {
   /** Provides predicates for mapping AST nodes to their named children. */
   module PrintAst {
     /** Gets a child of `node` returned by the member predicate with the given `name`. If the predicate takes an index argument, `i` is bound to that index, otherwise `i` is `-1` (which is never a valid index). */
-    AstNode getChild(AstNode node, string name, int i) {
+    F::AstNode getChild(F::AstNode node, string name, int i) {
       result = node.(BlameEntry).getDate() and i = -1 and name = "getDate"
       or
       result = node.(BlameEntry).getLine(i) and name = "getLine"
@@ -2127,10 +2547,36 @@ module Blame {
   }
 }
 
+module BlameFinal {
+  private module F = Blame;
+
+  import F
+
+  final class AstNode = F::AstNode;
+
+  final class Token = F::Token;
+
+  final class ReservedWord = F::ReservedWord;
+
+  final class BlameEntry = F::BlameEntry;
+
+  final class BlameInfo = F::BlameInfo;
+
+  final class Date = F::Date;
+
+  final class FileEntry = F::FileEntry;
+
+  final class Filename = F::Filename;
+
+  final class Number = F::Number;
+}
+
 overlay[local]
 module JSON {
+  private module F = JSON;
+
   /** The base class for all AST nodes */
-  private class AstNodeImpl extends @json_ast_node {
+  class AstNode extends @json_ast_node {
     /** Gets a string representation of this element. */
     string toString() { result = this.getAPrimaryQlClass() }
 
@@ -2138,13 +2584,13 @@ module JSON {
     final L::Location getLocation() { json_ast_node_location(this, result) }
 
     /** Gets the parent of this element. */
-    final AstNode getParent() { json_ast_node_parent(this, result, _) }
+    final F::AstNode getParent() { json_ast_node_parent(this, result, _) }
 
     /** Gets the index of this node among the children of its parent. */
     final int getParentIndex() { json_ast_node_parent(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    AstNode getAFieldOrChild() { none() }
+    F::AstNode getAFieldOrChild() { none() }
 
     /** Gets the name of the primary QL class for this element. */
     string getAPrimaryQlClass() { result = "???" }
@@ -2153,10 +2599,8 @@ module JSON {
     string getPrimaryQlClasses() { result = concat(this.getAPrimaryQlClass(), ",") }
   }
 
-  final class AstNode = AstNodeImpl;
-
   /** A token. */
-  private class TokenImpl extends @json_token, AstNodeImpl {
+  class Token extends @json_token, F::AstNode {
     /** Gets the value of this token. */
     final string getValue() { json_tokeninfo(this, _, result) }
 
@@ -2167,10 +2611,8 @@ module JSON {
     override string getAPrimaryQlClass() { result = "Token" }
   }
 
-  final class Token = TokenImpl;
-
   /** A reserved word. */
-  final class ReservedWord extends @json_reserved_word, TokenImpl {
+  class ReservedWord extends @json_reserved_word, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ReservedWord" }
   }
@@ -2195,111 +2637,123 @@ module JSON {
     )
   }
 
-  final class UnderscoreValue extends @json_underscore_value, AstNodeImpl { }
+  class UnderscoreValue extends @json_underscore_value, F::AstNode { }
 
   /** A class representing `array` nodes. */
-  final class Array extends @json_array, AstNodeImpl {
+  class Array extends @json_array, F::UnderscoreValue {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Array" }
 
     /** Gets the `i`th child of this node. */
-    final UnderscoreValue getChild(int i) { json_array_child(this, i, result) }
+    final F::UnderscoreValue getChild(int i) { json_array_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::UnderscoreValue getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { json_array_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { json_array_child(this, _, result) }
   }
 
   /** A class representing `comment` tokens. */
-  final class Comment extends @json_token_comment, TokenImpl {
+  class Comment extends @json_token_comment, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Comment" }
   }
 
   /** A class representing `document` nodes. */
-  final class Document extends @json_document, AstNodeImpl {
+  class Document extends @json_document, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Document" }
 
     /** Gets the `i`th child of this node. */
-    final UnderscoreValue getChild(int i) { json_document_child(this, i, result) }
+    final F::UnderscoreValue getChild(int i) { json_document_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::UnderscoreValue getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { json_document_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { json_document_child(this, _, result) }
   }
 
   /** A class representing `escape_sequence` tokens. */
-  final class EscapeSequence extends @json_token_escape_sequence, TokenImpl {
+  class EscapeSequence extends @json_token_escape_sequence, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "EscapeSequence" }
   }
 
   /** A class representing `false` tokens. */
-  final class False extends @json_token_false, TokenImpl {
+  class False extends @json_token_false, F::Token, F::UnderscoreValue {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "False" }
   }
 
   /** A class representing `null` tokens. */
-  final class Null extends @json_token_null, TokenImpl {
+  class Null extends @json_token_null, F::Token, F::UnderscoreValue {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Null" }
   }
 
   /** A class representing `number` tokens. */
-  final class Number extends @json_token_number, TokenImpl {
+  class Number extends @json_token_number, F::Token, F::UnderscoreValue {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Number" }
   }
 
   /** A class representing `object` nodes. */
-  final class Object extends @json_object, AstNodeImpl {
+  class Object extends @json_object, F::UnderscoreValue {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Object" }
 
     /** Gets the `i`th child of this node. */
-    final Pair getChild(int i) { json_object_child(this, i, result) }
+    final F::Pair getChild(int i) { json_object_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::Pair getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { json_object_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { json_object_child(this, _, result) }
   }
 
   /** A class representing `pair` nodes. */
-  final class Pair extends @json_pair, AstNodeImpl {
+  class Pair extends @json_pair, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Pair" }
 
     /** Gets the node corresponding to the field `key`. */
-    final String getKey() { json_pair_def(this, result, _) }
+    final F::String getKey() { json_pair_def(this, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreValue getValue() { json_pair_def(this, _, result) }
+    final F::UnderscoreValue getValue() { json_pair_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       json_pair_def(this, result, _) or json_pair_def(this, _, result)
     }
   }
 
   /** A class representing `string` nodes. */
-  final class String extends @json_string__, AstNodeImpl {
+  class String extends @json_string__, F::UnderscoreValue {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "String" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { json_string_child(this, i, result) }
+    final F::AstNode getChild(int i) { json_string_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { json_string_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { json_string_child(this, _, result) }
   }
 
   /** A class representing `string_content` tokens. */
-  final class StringContent extends @json_token_string_content, TokenImpl {
+  class StringContent extends @json_token_string_content, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "StringContent" }
   }
 
   /** A class representing `true` tokens. */
-  final class True extends @json_token_true, TokenImpl {
+  class True extends @json_token_true, F::Token, F::UnderscoreValue {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "True" }
   }
@@ -2307,7 +2761,7 @@ module JSON {
   /** Provides predicates for mapping AST nodes to their named children. */
   module PrintAst {
     /** Gets a child of `node` returned by the member predicate with the given `name`. If the predicate takes an index argument, `i` is bound to that index, otherwise `i` is `-1` (which is never a valid index). */
-    AstNode getChild(AstNode node, string name, int i) {
+    F::AstNode getChild(F::AstNode node, string name, int i) {
       result = node.(Array).getChild(i) and name = "getChild"
       or
       result = node.(Document).getChild(i) and name = "getChild"
@@ -2322,3 +2776,41 @@ module JSON {
     }
   }
 }
+
+module JSONFinal {
+  private module F = JSON;
+
+  import F
+
+  final class AstNode = F::AstNode;
+
+  final class Token = F::Token;
+
+  final class ReservedWord = F::ReservedWord;
+
+  final class UnderscoreValue = F::UnderscoreValue;
+
+  final class Array = F::Array;
+
+  final class Comment = F::Comment;
+
+  final class Document = F::Document;
+
+  final class EscapeSequence = F::EscapeSequence;
+
+  final class False = F::False;
+
+  final class Null = F::Null;
+
+  final class Number = F::Number;
+
+  final class Object = F::Object;
+
+  final class Pair = F::Pair;
+
+  final class String = F::String;
+
+  final class StringContent = F::StringContent;
+
+  final class True = F::True;
+}
diff --git a/ruby/extractor/src/generator.rs b/ruby/extractor/src/generator.rs
index 0430afd103e7..0fc6f9d5cc74 100644
--- a/ruby/extractor/src/generator.rs
+++ b/ruby/extractor/src/generator.rs
@@ -34,6 +34,7 @@ pub fn run(options: Options) -> std::io::Result<()> {
         languages,
         options.dbscheme,
         options.library,
+        false, // do not use facade AST
         "run 'make dbscheme' in ql/ruby/",
     )
 }
diff --git a/ruby/ql/lib/codeql/ruby/ast/internal/TreeSitter.qll b/ruby/ql/lib/codeql/ruby/ast/internal/TreeSitter.qll
index 13ae1923b105..0d442a5dda88 100644
--- a/ruby/ql/lib/codeql/ruby/ast/internal/TreeSitter.qll
+++ b/ruby/ql/lib/codeql/ruby/ast/internal/TreeSitter.qll
@@ -25,8 +25,10 @@ private predicate discardLocation(@location_default loc) {
 
 overlay[local]
 module Ruby {
+  private module F = Ruby;
+
   /** The base class for all AST nodes */
-  private class AstNodeImpl extends @ruby_ast_node {
+  class AstNode extends @ruby_ast_node {
     /** Gets a string representation of this element. */
     string toString() { result = this.getAPrimaryQlClass() }
 
@@ -34,13 +36,13 @@ module Ruby {
     final L::Location getLocation() { ruby_ast_node_location(this, result) }
 
     /** Gets the parent of this element. */
-    final AstNode getParent() { ruby_ast_node_parent(this, result, _) }
+    final F::AstNode getParent() { ruby_ast_node_parent(this, result, _) }
 
     /** Gets the index of this node among the children of its parent. */
     final int getParentIndex() { ruby_ast_node_parent(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    AstNode getAFieldOrChild() { none() }
+    F::AstNode getAFieldOrChild() { none() }
 
     /** Gets the name of the primary QL class for this element. */
     string getAPrimaryQlClass() { result = "???" }
@@ -49,10 +51,8 @@ module Ruby {
     string getPrimaryQlClasses() { result = concat(this.getAPrimaryQlClass(), ",") }
   }
 
-  final class AstNode = AstNodeImpl;
-
   /** A token. */
-  private class TokenImpl extends @ruby_token, AstNodeImpl {
+  class Token extends @ruby_token, F::AstNode {
     /** Gets the value of this token. */
     final string getValue() { ruby_tokeninfo(this, _, result) }
 
@@ -63,10 +63,8 @@ module Ruby {
     override string getAPrimaryQlClass() { result = "Token" }
   }
 
-  final class Token = TokenImpl;
-
   /** A reserved word. */
-  final class ReservedWord extends @ruby_reserved_word, TokenImpl {
+  class ReservedWord extends @ruby_reserved_word, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ReservedWord" }
   }
@@ -91,202 +89,236 @@ module Ruby {
     )
   }
 
-  final class UnderscoreArg extends @ruby_underscore_arg, AstNodeImpl { }
+  class UnderscoreArg extends @ruby_underscore_arg, F::UnderscoreExpression { }
 
-  final class UnderscoreCallOperator extends @ruby_underscore_call_operator, AstNodeImpl { }
+  class UnderscoreCallOperator extends @ruby_underscore_call_operator, F::AstNode { }
 
-  final class UnderscoreExpression extends @ruby_underscore_expression, AstNodeImpl { }
+  class UnderscoreExpression extends @ruby_underscore_expression, F::UnderscoreStatement { }
 
-  final class UnderscoreLhs extends @ruby_underscore_lhs, AstNodeImpl { }
+  class UnderscoreLhs extends @ruby_underscore_lhs, F::UnderscorePrimary { }
 
-  final class UnderscoreMethodName extends @ruby_underscore_method_name, AstNodeImpl { }
+  class UnderscoreMethodName extends @ruby_underscore_method_name, F::AstNode { }
 
-  final class UnderscoreNonlocalVariable extends @ruby_underscore_nonlocal_variable, AstNodeImpl { }
-
-  final class UnderscorePatternConstant extends @ruby_underscore_pattern_constant, AstNodeImpl { }
+  class UnderscoreNonlocalVariable extends @ruby_underscore_nonlocal_variable,
+    F::UnderscoreMethodName, F::UnderscoreVariable
+  { }
 
-  final class UnderscorePatternExpr extends @ruby_underscore_pattern_expr, AstNodeImpl { }
+  class UnderscorePatternConstant extends @ruby_underscore_pattern_constant,
+    F::UnderscorePatternExprBasic
+  { }
 
-  final class UnderscorePatternExprBasic extends @ruby_underscore_pattern_expr_basic, AstNodeImpl {
-  }
+  class UnderscorePatternExpr extends @ruby_underscore_pattern_expr, F::UnderscorePatternTopExprBody
+  { }
 
-  final class UnderscorePatternPrimitive extends @ruby_underscore_pattern_primitive, AstNodeImpl { }
+  class UnderscorePatternExprBasic extends @ruby_underscore_pattern_expr_basic,
+    F::UnderscorePatternExpr
+  { }
 
-  final class UnderscorePatternTopExprBody extends @ruby_underscore_pattern_top_expr_body,
-    AstNodeImpl
+  class UnderscorePatternPrimitive extends @ruby_underscore_pattern_primitive,
+    F::UnderscorePatternExprBasic
   { }
 
-  final class UnderscorePrimary extends @ruby_underscore_primary, AstNodeImpl { }
+  class UnderscorePatternTopExprBody extends @ruby_underscore_pattern_top_expr_body, F::AstNode { }
 
-  final class UnderscoreSimpleNumeric extends @ruby_underscore_simple_numeric, AstNodeImpl { }
+  class UnderscorePrimary extends @ruby_underscore_primary, F::UnderscoreArg { }
 
-  final class UnderscoreStatement extends @ruby_underscore_statement, AstNodeImpl { }
+  class UnderscoreSimpleNumeric extends @ruby_underscore_simple_numeric,
+    F::UnderscorePatternPrimitive, F::UnderscorePrimary
+  { }
+
+  class UnderscoreStatement extends @ruby_underscore_statement, F::AstNode { }
 
-  final class UnderscoreVariable extends @ruby_underscore_variable, AstNodeImpl { }
+  class UnderscoreVariable extends @ruby_underscore_variable, F::UnderscoreLhs { }
 
   /** A class representing `alias` nodes. */
-  final class Alias extends @ruby_alias, AstNodeImpl {
+  class Alias extends @ruby_alias, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Alias" }
 
     /** Gets the node corresponding to the field `alias`. */
-    final UnderscoreMethodName getAlias() { ruby_alias_def(this, result, _) }
+    final F::UnderscoreMethodName getAlias() { ruby_alias_def(this, result, _) }
 
     /** Gets the node corresponding to the field `name`. */
-    final UnderscoreMethodName getName() { ruby_alias_def(this, _, result) }
+    final F::UnderscoreMethodName getName() { ruby_alias_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_alias_def(this, result, _) or ruby_alias_def(this, _, result)
     }
   }
 
   /** A class representing `alternative_pattern` nodes. */
-  final class AlternativePattern extends @ruby_alternative_pattern, AstNodeImpl {
+  class AlternativePattern extends @ruby_alternative_pattern, F::UnderscorePatternExpr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AlternativePattern" }
 
     /** Gets the node corresponding to the field `alternatives`. */
-    final UnderscorePatternExprBasic getAlternatives(int i) {
+    final F::UnderscorePatternExprBasic getAlternatives(int i) {
       ruby_alternative_pattern_alternatives(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `alternatives`. */
+    final F::UnderscorePatternExprBasic getAnAlternatives() { result = this.getAlternatives(_) }
+
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_alternative_pattern_alternatives(this, _, result)
     }
   }
 
   /** A class representing `argument_list` nodes. */
-  final class ArgumentList extends @ruby_argument_list, AstNodeImpl {
+  class ArgumentList extends @ruby_argument_list, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ArgumentList" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_argument_list_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_argument_list_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_argument_list_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_argument_list_child(this, _, result) }
   }
 
   /** A class representing `array` nodes. */
-  final class Array extends @ruby_array, AstNodeImpl {
+  class Array extends @ruby_array, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Array" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_array_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_array_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_array_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_array_child(this, _, result) }
   }
 
   /** A class representing `array_pattern` nodes. */
-  final class ArrayPattern extends @ruby_array_pattern, AstNodeImpl {
+  class ArrayPattern extends @ruby_array_pattern, F::UnderscorePatternExprBasic,
+    F::UnderscorePatternTopExprBody
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ArrayPattern" }
 
     /** Gets the node corresponding to the field `class`. */
-    final UnderscorePatternConstant getClass() { ruby_array_pattern_class(this, result) }
+    final F::UnderscorePatternConstant getClass() { ruby_array_pattern_class(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_array_pattern_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_array_pattern_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_array_pattern_class(this, result) or ruby_array_pattern_child(this, _, result)
     }
   }
 
   /** A class representing `as_pattern` nodes. */
-  final class AsPattern extends @ruby_as_pattern, AstNodeImpl {
+  class AsPattern extends @ruby_as_pattern, F::UnderscorePatternExpr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AsPattern" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { ruby_as_pattern_def(this, result, _) }
+    final F::Identifier getName() { ruby_as_pattern_def(this, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscorePatternExpr getValue() { ruby_as_pattern_def(this, _, result) }
+    final F::UnderscorePatternExpr getValue() { ruby_as_pattern_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_as_pattern_def(this, result, _) or ruby_as_pattern_def(this, _, result)
     }
   }
 
   /** A class representing `assignment` nodes. */
-  final class Assignment extends @ruby_assignment, AstNodeImpl {
+  class Assignment extends @ruby_assignment, F::UnderscoreArg, F::UnderscoreExpression {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Assignment" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ruby_assignment_def(this, result, _) }
+    final F::AstNode getLeft() { ruby_assignment_def(this, result, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ruby_assignment_def(this, _, result) }
+    final F::AstNode getRight() { ruby_assignment_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_assignment_def(this, result, _) or ruby_assignment_def(this, _, result)
     }
   }
 
   /** A class representing `bare_string` nodes. */
-  final class BareString extends @ruby_bare_string, AstNodeImpl {
+  class BareString extends @ruby_bare_string, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BareString" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_bare_string_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_bare_string_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_bare_string_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_bare_string_child(this, _, result) }
   }
 
   /** A class representing `bare_symbol` nodes. */
-  final class BareSymbol extends @ruby_bare_symbol, AstNodeImpl {
+  class BareSymbol extends @ruby_bare_symbol, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BareSymbol" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_bare_symbol_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_bare_symbol_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_bare_symbol_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_bare_symbol_child(this, _, result) }
   }
 
   /** A class representing `begin` nodes. */
-  final class Begin extends @ruby_begin, AstNodeImpl {
+  class Begin extends @ruby_begin, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Begin" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_begin_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_begin_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_begin_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_begin_child(this, _, result) }
   }
 
   /** A class representing `begin_block` nodes. */
-  final class BeginBlock extends @ruby_begin_block, AstNodeImpl {
+  class BeginBlock extends @ruby_begin_block, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BeginBlock" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_begin_block_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_begin_block_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_begin_block_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_begin_block_child(this, _, result) }
   }
 
   /** A class representing `binary` nodes. */
-  final class Binary extends @ruby_binary, AstNodeImpl {
+  class Binary extends @ruby_binary, F::UnderscoreArg, F::UnderscoreExpression {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Binary" }
 
     /** Gets the node corresponding to the field `left`. */
-    final AstNode getLeft() { ruby_binary_def(this, result, _, _) }
+    final F::AstNode getLeft() { ruby_binary_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `operator`. */
     final string getOperator() {
@@ -344,130 +376,142 @@ module Ruby {
     }
 
     /** Gets the node corresponding to the field `right`. */
-    final UnderscoreExpression getRight() { ruby_binary_def(this, _, _, result) }
+    final F::UnderscoreExpression getRight() { ruby_binary_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_binary_def(this, result, _, _) or ruby_binary_def(this, _, _, result)
     }
   }
 
   /** A class representing `block` nodes. */
-  final class Block extends @ruby_block, AstNodeImpl {
+  class Block extends @ruby_block, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Block" }
 
     /** Gets the node corresponding to the field `body`. */
-    final BlockBody getBody() { ruby_block_body(this, result) }
+    final F::BlockBody getBody() { ruby_block_body(this, result) }
 
     /** Gets the node corresponding to the field `parameters`. */
-    final BlockParameters getParameters() { ruby_block_parameters(this, result) }
+    final F::BlockParameters getParameters() { ruby_block_parameters(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_block_body(this, result) or ruby_block_parameters(this, result)
     }
   }
 
   /** A class representing `block_argument` nodes. */
-  final class BlockArgument extends @ruby_block_argument, AstNodeImpl {
+  class BlockArgument extends @ruby_block_argument, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BlockArgument" }
 
     /** Gets the child of this node. */
-    final UnderscoreArg getChild() { ruby_block_argument_child(this, result) }
+    final F::UnderscoreArg getChild() { ruby_block_argument_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_block_argument_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_block_argument_child(this, result) }
   }
 
   /** A class representing `block_body` nodes. */
-  final class BlockBody extends @ruby_block_body, AstNodeImpl {
+  class BlockBody extends @ruby_block_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BlockBody" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_block_body_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_block_body_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_block_body_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_block_body_child(this, _, result) }
   }
 
   /** A class representing `block_parameter` nodes. */
-  final class BlockParameter extends @ruby_block_parameter, AstNodeImpl {
+  class BlockParameter extends @ruby_block_parameter, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BlockParameter" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { ruby_block_parameter_name(this, result) }
+    final F::Identifier getName() { ruby_block_parameter_name(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_block_parameter_name(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_block_parameter_name(this, result) }
   }
 
   /** A class representing `block_parameters` nodes. */
-  final class BlockParameters extends @ruby_block_parameters, AstNodeImpl {
+  class BlockParameters extends @ruby_block_parameters, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BlockParameters" }
 
     /** Gets the node corresponding to the field `locals`. */
-    final Identifier getLocals(int i) { ruby_block_parameters_locals(this, i, result) }
+    final F::Identifier getLocals(int i) { ruby_block_parameters_locals(this, i, result) }
+
+    /** Gets the node corresponding to the field `locals`. */
+    final F::Identifier getALocals() { result = this.getLocals(_) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_block_parameters_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_block_parameters_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_block_parameters_locals(this, _, result) or ruby_block_parameters_child(this, _, result)
     }
   }
 
   /** A class representing `body_statement` nodes. */
-  final class BodyStatement extends @ruby_body_statement, AstNodeImpl {
+  class BodyStatement extends @ruby_body_statement, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BodyStatement" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_body_statement_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_body_statement_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_body_statement_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_body_statement_child(this, _, result) }
   }
 
   /** A class representing `break` nodes. */
-  final class Break extends @ruby_break, AstNodeImpl {
+  class Break extends @ruby_break, F::UnderscoreExpression, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Break" }
 
     /** Gets the child of this node. */
-    final ArgumentList getChild() { ruby_break_child(this, result) }
+    final F::ArgumentList getChild() { ruby_break_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_break_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_break_child(this, result) }
   }
 
   /** A class representing `call` nodes. */
-  final class Call extends @ruby_call, AstNodeImpl {
+  class Call extends @ruby_call, F::UnderscoreExpression, F::UnderscoreLhs, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Call" }
 
     /** Gets the node corresponding to the field `arguments`. */
-    final ArgumentList getArguments() { ruby_call_arguments(this, result) }
+    final F::ArgumentList getArguments() { ruby_call_arguments(this, result) }
 
     /** Gets the node corresponding to the field `block`. */
-    final AstNode getBlock() { ruby_call_block(this, result) }
+    final F::AstNode getBlock() { ruby_call_block(this, result) }
 
     /** Gets the node corresponding to the field `method`. */
-    final AstNode getMethod() { ruby_call_method(this, result) }
+    final F::AstNode getMethod() { ruby_call_method(this, result) }
 
     /** Gets the node corresponding to the field `operator`. */
-    final UnderscoreCallOperator getOperator() { ruby_call_operator(this, result) }
+    final F::UnderscoreCallOperator getOperator() { ruby_call_operator(this, result) }
 
     /** Gets the node corresponding to the field `receiver`. */
-    final UnderscorePrimary getReceiver() { ruby_call_receiver(this, result) }
+    final F::UnderscorePrimary getReceiver() { ruby_call_receiver(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_call_arguments(this, result) or
       ruby_call_block(this, result) or
       ruby_call_method(this, result) or
@@ -477,38 +521,44 @@ module Ruby {
   }
 
   /** A class representing `case` nodes. */
-  final class Case extends @ruby_case__, AstNodeImpl {
+  class Case extends @ruby_case__, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Case" }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreStatement getValue() { ruby_case_value(this, result) }
+    final F::UnderscoreStatement getValue() { ruby_case_value(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_case_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_case_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_case_value(this, result) or ruby_case_child(this, _, result)
     }
   }
 
   /** A class representing `case_match` nodes. */
-  final class CaseMatch extends @ruby_case_match, AstNodeImpl {
+  class CaseMatch extends @ruby_case_match, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CaseMatch" }
 
     /** Gets the node corresponding to the field `clauses`. */
-    final InClause getClauses(int i) { ruby_case_match_clauses(this, i, result) }
+    final F::InClause getClauses(int i) { ruby_case_match_clauses(this, i, result) }
+
+    /** Gets the node corresponding to the field `clauses`. */
+    final F::InClause getAClauses() { result = this.getClauses(_) }
 
     /** Gets the node corresponding to the field `else`. */
-    final Else getElse() { ruby_case_match_else(this, result) }
+    final F::Else getElse() { ruby_case_match_else(this, result) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreStatement getValue() { ruby_case_match_def(this, result) }
+    final F::UnderscoreStatement getValue() { ruby_case_match_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_case_match_clauses(this, _, result) or
       ruby_case_match_else(this, result) or
       ruby_case_match_def(this, result)
@@ -516,39 +566,42 @@ module Ruby {
   }
 
   /** A class representing `chained_string` nodes. */
-  final class ChainedString extends @ruby_chained_string, AstNodeImpl {
+  class ChainedString extends @ruby_chained_string, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ChainedString" }
 
     /** Gets the `i`th child of this node. */
-    final String getChild(int i) { ruby_chained_string_child(this, i, result) }
+    final F::String getChild(int i) { ruby_chained_string_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::String getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_chained_string_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_chained_string_child(this, _, result) }
   }
 
   /** A class representing `character` tokens. */
-  final class Character extends @ruby_token_character, TokenImpl {
+  class Character extends @ruby_token_character, F::Token, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Character" }
   }
 
   /** A class representing `class` nodes. */
-  final class Class extends @ruby_class, AstNodeImpl {
+  class Class extends @ruby_class, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Class" }
 
     /** Gets the node corresponding to the field `body`. */
-    final BodyStatement getBody() { ruby_class_body(this, result) }
+    final F::BodyStatement getBody() { ruby_class_body(this, result) }
 
     /** Gets the node corresponding to the field `name`. */
-    final AstNode getName() { ruby_class_def(this, result) }
+    final F::AstNode getName() { ruby_class_def(this, result) }
 
     /** Gets the node corresponding to the field `superclass`. */
-    final Superclass getSuperclass() { ruby_class_superclass(this, result) }
+    final F::Superclass getSuperclass() { ruby_class_superclass(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_class_body(this, result) or
       ruby_class_def(this, result) or
       ruby_class_superclass(this, result)
@@ -556,45 +609,45 @@ module Ruby {
   }
 
   /** A class representing `class_variable` tokens. */
-  final class ClassVariable extends @ruby_token_class_variable, TokenImpl {
+  class ClassVariable extends @ruby_token_class_variable, F::Token, F::UnderscoreNonlocalVariable {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ClassVariable" }
   }
 
   /** A class representing `comment` tokens. */
-  final class Comment extends @ruby_token_comment, TokenImpl {
+  class Comment extends @ruby_token_comment, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Comment" }
   }
 
   /** A class representing `complex` nodes. */
-  final class Complex extends @ruby_complex, AstNodeImpl {
+  class Complex extends @ruby_complex, F::UnderscoreSimpleNumeric {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Complex" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ruby_complex_def(this, result) }
+    final F::AstNode getChild() { ruby_complex_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_complex_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_complex_def(this, result) }
   }
 
   /** A class representing `conditional` nodes. */
-  final class Conditional extends @ruby_conditional, AstNodeImpl {
+  class Conditional extends @ruby_conditional, F::UnderscoreArg {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Conditional" }
 
     /** Gets the node corresponding to the field `alternative`. */
-    final UnderscoreArg getAlternative() { ruby_conditional_def(this, result, _, _) }
+    final F::UnderscoreArg getAlternative() { ruby_conditional_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreArg getCondition() { ruby_conditional_def(this, _, result, _) }
+    final F::UnderscoreArg getCondition() { ruby_conditional_def(this, _, result, _) }
 
     /** Gets the node corresponding to the field `consequence`. */
-    final UnderscoreArg getConsequence() { ruby_conditional_def(this, _, _, result) }
+    final F::UnderscoreArg getConsequence() { ruby_conditional_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_conditional_def(this, result, _, _) or
       ruby_conditional_def(this, _, result, _) or
       ruby_conditional_def(this, _, _, result)
@@ -602,94 +655,115 @@ module Ruby {
   }
 
   /** A class representing `constant` tokens. */
-  final class Constant extends @ruby_token_constant, TokenImpl {
+  class Constant extends @ruby_token_constant, F::Token, F::UnderscoreMethodName,
+    F::UnderscorePatternConstant, F::UnderscoreVariable
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Constant" }
   }
 
   /** A class representing `delimited_symbol` nodes. */
-  final class DelimitedSymbol extends @ruby_delimited_symbol, AstNodeImpl {
+  class DelimitedSymbol extends @ruby_delimited_symbol, F::UnderscoreMethodName,
+    F::UnderscorePatternPrimitive, F::UnderscorePrimary
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "DelimitedSymbol" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_delimited_symbol_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_delimited_symbol_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_delimited_symbol_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_delimited_symbol_child(this, _, result) }
   }
 
   /** A class representing `destructured_left_assignment` nodes. */
-  final class DestructuredLeftAssignment extends @ruby_destructured_left_assignment, AstNodeImpl {
+  class DestructuredLeftAssignment extends @ruby_destructured_left_assignment, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "DestructuredLeftAssignment" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_destructured_left_assignment_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_destructured_left_assignment_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_destructured_left_assignment_child(this, _, result)
     }
   }
 
   /** A class representing `destructured_parameter` nodes. */
-  final class DestructuredParameter extends @ruby_destructured_parameter, AstNodeImpl {
+  class DestructuredParameter extends @ruby_destructured_parameter, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "DestructuredParameter" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_destructured_parameter_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_destructured_parameter_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_destructured_parameter_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() {
+      ruby_destructured_parameter_child(this, _, result)
+    }
   }
 
   /** A class representing `do` nodes. */
-  final class Do extends @ruby_do, AstNodeImpl {
+  class Do extends @ruby_do, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Do" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_do_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_do_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_do_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_do_child(this, _, result) }
   }
 
   /** A class representing `do_block` nodes. */
-  final class DoBlock extends @ruby_do_block, AstNodeImpl {
+  class DoBlock extends @ruby_do_block, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "DoBlock" }
 
     /** Gets the node corresponding to the field `body`. */
-    final BodyStatement getBody() { ruby_do_block_body(this, result) }
+    final F::BodyStatement getBody() { ruby_do_block_body(this, result) }
 
     /** Gets the node corresponding to the field `parameters`. */
-    final BlockParameters getParameters() { ruby_do_block_parameters(this, result) }
+    final F::BlockParameters getParameters() { ruby_do_block_parameters(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_do_block_body(this, result) or ruby_do_block_parameters(this, result)
     }
   }
 
   /** A class representing `element_reference` nodes. */
-  final class ElementReference extends @ruby_element_reference, AstNodeImpl {
+  class ElementReference extends @ruby_element_reference, F::UnderscoreLhs {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ElementReference" }
 
     /** Gets the node corresponding to the field `block`. */
-    final AstNode getBlock() { ruby_element_reference_block(this, result) }
+    final F::AstNode getBlock() { ruby_element_reference_block(this, result) }
 
     /** Gets the node corresponding to the field `object`. */
-    final UnderscorePrimary getObject() { ruby_element_reference_def(this, result) }
+    final F::UnderscorePrimary getObject() { ruby_element_reference_def(this, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getChild(int i) { ruby_element_reference_child(this, i, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_element_reference_child(this, i, result) }
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_element_reference_block(this, result) or
       ruby_element_reference_def(this, result) or
       ruby_element_reference_child(this, _, result)
@@ -697,33 +771,36 @@ module Ruby {
   }
 
   /** A class representing `else` nodes. */
-  final class Else extends @ruby_else, AstNodeImpl {
+  class Else extends @ruby_else, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Else" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_else_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_else_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_else_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_else_child(this, _, result) }
   }
 
   /** A class representing `elsif` nodes. */
-  final class Elsif extends @ruby_elsif, AstNodeImpl {
+  class Elsif extends @ruby_elsif, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Elsif" }
 
     /** Gets the node corresponding to the field `alternative`. */
-    final AstNode getAlternative() { ruby_elsif_alternative(this, result) }
+    final F::AstNode getAlternative() { ruby_elsif_alternative(this, result) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreStatement getCondition() { ruby_elsif_def(this, result) }
+    final F::UnderscoreStatement getCondition() { ruby_elsif_def(this, result) }
 
     /** Gets the node corresponding to the field `consequence`. */
-    final Then getConsequence() { ruby_elsif_consequence(this, result) }
+    final F::Then getConsequence() { ruby_elsif_consequence(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_elsif_alternative(this, result) or
       ruby_elsif_def(this, result) or
       ruby_elsif_consequence(this, result)
@@ -731,136 +808,152 @@ module Ruby {
   }
 
   /** A class representing `empty_statement` tokens. */
-  final class EmptyStatement extends @ruby_token_empty_statement, TokenImpl {
+  class EmptyStatement extends @ruby_token_empty_statement, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "EmptyStatement" }
   }
 
   /** A class representing `encoding` tokens. */
-  final class Encoding extends @ruby_token_encoding, TokenImpl {
+  class Encoding extends @ruby_token_encoding, F::Token, F::UnderscorePatternPrimitive {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Encoding" }
   }
 
   /** A class representing `end_block` nodes. */
-  final class EndBlock extends @ruby_end_block, AstNodeImpl {
+  class EndBlock extends @ruby_end_block, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "EndBlock" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_end_block_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_end_block_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_end_block_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_end_block_child(this, _, result) }
   }
 
   /** A class representing `ensure` nodes. */
-  final class Ensure extends @ruby_ensure, AstNodeImpl {
+  class Ensure extends @ruby_ensure, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Ensure" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_ensure_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_ensure_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_ensure_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_ensure_child(this, _, result) }
   }
 
   /** A class representing `escape_sequence` tokens. */
-  final class EscapeSequence extends @ruby_token_escape_sequence, TokenImpl {
+  class EscapeSequence extends @ruby_token_escape_sequence, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "EscapeSequence" }
   }
 
   /** A class representing `exception_variable` nodes. */
-  final class ExceptionVariable extends @ruby_exception_variable, AstNodeImpl {
+  class ExceptionVariable extends @ruby_exception_variable, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ExceptionVariable" }
 
     /** Gets the child of this node. */
-    final UnderscoreLhs getChild() { ruby_exception_variable_def(this, result) }
+    final F::UnderscoreLhs getChild() { ruby_exception_variable_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_exception_variable_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_exception_variable_def(this, result) }
   }
 
   /** A class representing `exceptions` nodes. */
-  final class Exceptions extends @ruby_exceptions, AstNodeImpl {
+  class Exceptions extends @ruby_exceptions, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Exceptions" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_exceptions_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_exceptions_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_exceptions_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_exceptions_child(this, _, result) }
   }
 
   /** A class representing `expression_reference_pattern` nodes. */
-  final class ExpressionReferencePattern extends @ruby_expression_reference_pattern, AstNodeImpl {
+  class ExpressionReferencePattern extends @ruby_expression_reference_pattern,
+    F::UnderscorePatternExprBasic
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ExpressionReferencePattern" }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreExpression getValue() { ruby_expression_reference_pattern_def(this, result) }
+    final F::UnderscoreExpression getValue() { ruby_expression_reference_pattern_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_expression_reference_pattern_def(this, result)
     }
   }
 
   /** A class representing `false` tokens. */
-  final class False extends @ruby_token_false, TokenImpl {
+  class False extends @ruby_token_false, F::Token, F::UnderscoreLhs, F::UnderscorePatternPrimitive {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "False" }
   }
 
   /** A class representing `file` tokens. */
-  final class File extends @ruby_token_file, TokenImpl {
+  class File extends @ruby_token_file, F::Token, F::UnderscorePatternPrimitive {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "File" }
   }
 
   /** A class representing `find_pattern` nodes. */
-  final class FindPattern extends @ruby_find_pattern, AstNodeImpl {
+  class FindPattern extends @ruby_find_pattern, F::UnderscorePatternExprBasic,
+    F::UnderscorePatternTopExprBody
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "FindPattern" }
 
     /** Gets the node corresponding to the field `class`. */
-    final UnderscorePatternConstant getClass() { ruby_find_pattern_class(this, result) }
+    final F::UnderscorePatternConstant getClass() { ruby_find_pattern_class(this, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_find_pattern_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_find_pattern_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_find_pattern_class(this, result) or ruby_find_pattern_child(this, _, result)
     }
   }
 
   /** A class representing `float` tokens. */
-  final class Float extends @ruby_token_float, TokenImpl {
+  class Float extends @ruby_token_float, F::Token, F::UnderscoreSimpleNumeric {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Float" }
   }
 
   /** A class representing `for` nodes. */
-  final class For extends @ruby_for, AstNodeImpl {
+  class For extends @ruby_for, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "For" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Do getBody() { ruby_for_def(this, result, _, _) }
+    final F::Do getBody() { ruby_for_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final AstNode getPattern() { ruby_for_def(this, _, result, _) }
+    final F::AstNode getPattern() { ruby_for_def(this, _, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final In getValue() { ruby_for_def(this, _, _, result) }
+    final F::In getValue() { ruby_for_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_for_def(this, result, _, _) or
       ruby_for_def(this, _, result, _) or
       ruby_for_def(this, _, _, result)
@@ -868,140 +961,155 @@ module Ruby {
   }
 
   /** A class representing `forward_argument` tokens. */
-  final class ForwardArgument extends @ruby_token_forward_argument, TokenImpl {
+  class ForwardArgument extends @ruby_token_forward_argument, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ForwardArgument" }
   }
 
   /** A class representing `forward_parameter` tokens. */
-  final class ForwardParameter extends @ruby_token_forward_parameter, TokenImpl {
+  class ForwardParameter extends @ruby_token_forward_parameter, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ForwardParameter" }
   }
 
   /** A class representing `global_variable` tokens. */
-  final class GlobalVariable extends @ruby_token_global_variable, TokenImpl {
+  class GlobalVariable extends @ruby_token_global_variable, F::Token, F::UnderscoreNonlocalVariable {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "GlobalVariable" }
   }
 
   /** A class representing `hash` nodes. */
-  final class Hash extends @ruby_hash, AstNodeImpl {
+  class Hash extends @ruby_hash, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Hash" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_hash_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_hash_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_hash_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_hash_child(this, _, result) }
   }
 
   /** A class representing `hash_key_symbol` tokens. */
-  final class HashKeySymbol extends @ruby_token_hash_key_symbol, TokenImpl {
+  class HashKeySymbol extends @ruby_token_hash_key_symbol, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HashKeySymbol" }
   }
 
   /** A class representing `hash_pattern` nodes. */
-  final class HashPattern extends @ruby_hash_pattern, AstNodeImpl {
+  class HashPattern extends @ruby_hash_pattern, F::UnderscorePatternExprBasic,
+    F::UnderscorePatternTopExprBody
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HashPattern" }
 
     /** Gets the node corresponding to the field `class`. */
-    final UnderscorePatternConstant getClass() { ruby_hash_pattern_class(this, result) }
+    final F::UnderscorePatternConstant getClass() { ruby_hash_pattern_class(this, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getChild(int i) { ruby_hash_pattern_child(this, i, result) }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_hash_pattern_child(this, i, result) }
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_hash_pattern_class(this, result) or ruby_hash_pattern_child(this, _, result)
     }
   }
 
   /** A class representing `hash_splat_argument` nodes. */
-  final class HashSplatArgument extends @ruby_hash_splat_argument, AstNodeImpl {
+  class HashSplatArgument extends @ruby_hash_splat_argument, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HashSplatArgument" }
 
     /** Gets the child of this node. */
-    final UnderscoreArg getChild() { ruby_hash_splat_argument_child(this, result) }
+    final F::UnderscoreArg getChild() { ruby_hash_splat_argument_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_hash_splat_argument_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_hash_splat_argument_child(this, result) }
   }
 
   /** A class representing `hash_splat_nil` tokens. */
-  final class HashSplatNil extends @ruby_token_hash_splat_nil, TokenImpl {
+  class HashSplatNil extends @ruby_token_hash_splat_nil, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HashSplatNil" }
   }
 
   /** A class representing `hash_splat_parameter` nodes. */
-  final class HashSplatParameter extends @ruby_hash_splat_parameter, AstNodeImpl {
+  class HashSplatParameter extends @ruby_hash_splat_parameter, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HashSplatParameter" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { ruby_hash_splat_parameter_name(this, result) }
+    final F::Identifier getName() { ruby_hash_splat_parameter_name(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_hash_splat_parameter_name(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_hash_splat_parameter_name(this, result) }
   }
 
   /** A class representing `heredoc_beginning` tokens. */
-  final class HeredocBeginning extends @ruby_token_heredoc_beginning, TokenImpl {
+  class HeredocBeginning extends @ruby_token_heredoc_beginning, F::Token,
+    F::UnderscorePatternPrimitive, F::UnderscorePrimary
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HeredocBeginning" }
   }
 
   /** A class representing `heredoc_body` nodes. */
-  final class HeredocBody extends @ruby_heredoc_body, AstNodeImpl {
+  class HeredocBody extends @ruby_heredoc_body, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HeredocBody" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_heredoc_body_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_heredoc_body_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_heredoc_body_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_heredoc_body_child(this, _, result) }
   }
 
   /** A class representing `heredoc_content` tokens. */
-  final class HeredocContent extends @ruby_token_heredoc_content, TokenImpl {
+  class HeredocContent extends @ruby_token_heredoc_content, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HeredocContent" }
   }
 
   /** A class representing `heredoc_end` tokens. */
-  final class HeredocEnd extends @ruby_token_heredoc_end, TokenImpl {
+  class HeredocEnd extends @ruby_token_heredoc_end, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "HeredocEnd" }
   }
 
   /** A class representing `identifier` tokens. */
-  final class Identifier extends @ruby_token_identifier, TokenImpl {
+  class Identifier extends @ruby_token_identifier, F::Token, F::UnderscoreMethodName,
+    F::UnderscorePatternExprBasic, F::UnderscoreVariable
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Identifier" }
   }
 
   /** A class representing `if` nodes. */
-  final class If extends @ruby_if, AstNodeImpl {
+  class If extends @ruby_if, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "If" }
 
     /** Gets the node corresponding to the field `alternative`. */
-    final AstNode getAlternative() { ruby_if_alternative(this, result) }
+    final F::AstNode getAlternative() { ruby_if_alternative(this, result) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreStatement getCondition() { ruby_if_def(this, result) }
+    final F::UnderscoreStatement getCondition() { ruby_if_def(this, result) }
 
     /** Gets the node corresponding to the field `consequence`. */
-    final Then getConsequence() { ruby_if_consequence(this, result) }
+    final F::Then getConsequence() { ruby_if_consequence(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_if_alternative(this, result) or
       ruby_if_def(this, result) or
       ruby_if_consequence(this, result)
@@ -1009,62 +1117,62 @@ module Ruby {
   }
 
   /** A class representing `if_guard` nodes. */
-  final class IfGuard extends @ruby_if_guard, AstNodeImpl {
+  class IfGuard extends @ruby_if_guard, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "IfGuard" }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreExpression getCondition() { ruby_if_guard_def(this, result) }
+    final F::UnderscoreExpression getCondition() { ruby_if_guard_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_if_guard_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_if_guard_def(this, result) }
   }
 
   /** A class representing `if_modifier` nodes. */
-  final class IfModifier extends @ruby_if_modifier, AstNodeImpl {
+  class IfModifier extends @ruby_if_modifier, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "IfModifier" }
 
     /** Gets the node corresponding to the field `body`. */
-    final UnderscoreStatement getBody() { ruby_if_modifier_def(this, result, _) }
+    final F::UnderscoreStatement getBody() { ruby_if_modifier_def(this, result, _) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreExpression getCondition() { ruby_if_modifier_def(this, _, result) }
+    final F::UnderscoreExpression getCondition() { ruby_if_modifier_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_if_modifier_def(this, result, _) or ruby_if_modifier_def(this, _, result)
     }
   }
 
   /** A class representing `in` nodes. */
-  final class In extends @ruby_in, AstNodeImpl {
+  class In extends @ruby_in, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "In" }
 
     /** Gets the child of this node. */
-    final UnderscoreArg getChild() { ruby_in_def(this, result) }
+    final F::UnderscoreArg getChild() { ruby_in_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_in_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_in_def(this, result) }
   }
 
   /** A class representing `in_clause` nodes. */
-  final class InClause extends @ruby_in_clause, AstNodeImpl {
+  class InClause extends @ruby_in_clause, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "InClause" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Then getBody() { ruby_in_clause_body(this, result) }
+    final F::Then getBody() { ruby_in_clause_body(this, result) }
 
     /** Gets the node corresponding to the field `guard`. */
-    final AstNode getGuard() { ruby_in_clause_guard(this, result) }
+    final F::AstNode getGuard() { ruby_in_clause_guard(this, result) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final UnderscorePatternTopExprBody getPattern() { ruby_in_clause_def(this, result) }
+    final F::UnderscorePatternTopExprBody getPattern() { ruby_in_clause_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_in_clause_body(this, result) or
       ruby_in_clause_guard(this, result) or
       ruby_in_clause_def(this, result)
@@ -1072,143 +1180,156 @@ module Ruby {
   }
 
   /** A class representing `instance_variable` tokens. */
-  final class InstanceVariable extends @ruby_token_instance_variable, TokenImpl {
+  class InstanceVariable extends @ruby_token_instance_variable, F::Token,
+    F::UnderscoreNonlocalVariable
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "InstanceVariable" }
   }
 
   /** A class representing `integer` tokens. */
-  final class Integer extends @ruby_token_integer, TokenImpl {
+  class Integer extends @ruby_token_integer, F::Token, F::UnderscoreSimpleNumeric {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Integer" }
   }
 
   /** A class representing `interpolation` nodes. */
-  final class Interpolation extends @ruby_interpolation, AstNodeImpl {
+  class Interpolation extends @ruby_interpolation, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Interpolation" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_interpolation_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_interpolation_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_interpolation_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_interpolation_child(this, _, result) }
   }
 
   /** A class representing `keyword_parameter` nodes. */
-  final class KeywordParameter extends @ruby_keyword_parameter, AstNodeImpl {
+  class KeywordParameter extends @ruby_keyword_parameter, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "KeywordParameter" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { ruby_keyword_parameter_def(this, result) }
+    final F::Identifier getName() { ruby_keyword_parameter_def(this, result) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreArg getValue() { ruby_keyword_parameter_value(this, result) }
+    final F::UnderscoreArg getValue() { ruby_keyword_parameter_value(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_keyword_parameter_def(this, result) or ruby_keyword_parameter_value(this, result)
     }
   }
 
   /** A class representing `keyword_pattern` nodes. */
-  final class KeywordPattern extends @ruby_keyword_pattern, AstNodeImpl {
+  class KeywordPattern extends @ruby_keyword_pattern, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "KeywordPattern" }
 
     /** Gets the node corresponding to the field `key`. */
-    final AstNode getKey() { ruby_keyword_pattern_def(this, result) }
+    final F::AstNode getKey() { ruby_keyword_pattern_def(this, result) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscorePatternExpr getValue() { ruby_keyword_pattern_value(this, result) }
+    final F::UnderscorePatternExpr getValue() { ruby_keyword_pattern_value(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_keyword_pattern_def(this, result) or ruby_keyword_pattern_value(this, result)
     }
   }
 
   /** A class representing `lambda` nodes. */
-  final class Lambda extends @ruby_lambda, AstNodeImpl {
+  class Lambda extends @ruby_lambda, F::UnderscorePatternPrimitive, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Lambda" }
 
     /** Gets the node corresponding to the field `body`. */
-    final AstNode getBody() { ruby_lambda_def(this, result) }
+    final F::AstNode getBody() { ruby_lambda_def(this, result) }
 
     /** Gets the node corresponding to the field `parameters`. */
-    final LambdaParameters getParameters() { ruby_lambda_parameters(this, result) }
+    final F::LambdaParameters getParameters() { ruby_lambda_parameters(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_lambda_def(this, result) or ruby_lambda_parameters(this, result)
     }
   }
 
   /** A class representing `lambda_parameters` nodes. */
-  final class LambdaParameters extends @ruby_lambda_parameters, AstNodeImpl {
+  class LambdaParameters extends @ruby_lambda_parameters, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "LambdaParameters" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_lambda_parameters_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_lambda_parameters_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_lambda_parameters_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_lambda_parameters_child(this, _, result) }
   }
 
   /** A class representing `left_assignment_list` nodes. */
-  final class LeftAssignmentList extends @ruby_left_assignment_list, AstNodeImpl {
+  class LeftAssignmentList extends @ruby_left_assignment_list, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "LeftAssignmentList" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_left_assignment_list_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_left_assignment_list_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_left_assignment_list_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() {
+      ruby_left_assignment_list_child(this, _, result)
+    }
   }
 
   /** A class representing `line` tokens. */
-  final class Line extends @ruby_token_line, TokenImpl {
+  class Line extends @ruby_token_line, F::Token, F::UnderscorePatternPrimitive {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Line" }
   }
 
   /** A class representing `match_pattern` nodes. */
-  final class MatchPattern extends @ruby_match_pattern, AstNodeImpl {
+  class MatchPattern extends @ruby_match_pattern, F::UnderscoreExpression {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "MatchPattern" }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final UnderscorePatternTopExprBody getPattern() { ruby_match_pattern_def(this, result, _) }
+    final F::UnderscorePatternTopExprBody getPattern() { ruby_match_pattern_def(this, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreArg getValue() { ruby_match_pattern_def(this, _, result) }
+    final F::UnderscoreArg getValue() { ruby_match_pattern_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_match_pattern_def(this, result, _) or ruby_match_pattern_def(this, _, result)
     }
   }
 
   /** A class representing `method` nodes. */
-  final class Method extends @ruby_method, AstNodeImpl {
+  class Method extends @ruby_method, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Method" }
 
     /** Gets the node corresponding to the field `body`. */
-    final AstNode getBody() { ruby_method_body(this, result) }
+    final F::AstNode getBody() { ruby_method_body(this, result) }
 
     /** Gets the node corresponding to the field `name`. */
-    final UnderscoreMethodName getName() { ruby_method_def(this, result) }
+    final F::UnderscoreMethodName getName() { ruby_method_def(this, result) }
 
     /** Gets the node corresponding to the field `parameters`. */
-    final MethodParameters getParameters() { ruby_method_parameters(this, result) }
+    final F::MethodParameters getParameters() { ruby_method_parameters(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_method_body(this, result) or
       ruby_method_def(this, result) or
       ruby_method_parameters(this, result)
@@ -1216,65 +1337,70 @@ module Ruby {
   }
 
   /** A class representing `method_parameters` nodes. */
-  final class MethodParameters extends @ruby_method_parameters, AstNodeImpl {
+  class MethodParameters extends @ruby_method_parameters, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "MethodParameters" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_method_parameters_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_method_parameters_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_method_parameters_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_method_parameters_child(this, _, result) }
   }
 
   /** A class representing `module` nodes. */
-  final class Module extends @ruby_module, AstNodeImpl {
+  class Module extends @ruby_module, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Module" }
 
     /** Gets the node corresponding to the field `body`. */
-    final BodyStatement getBody() { ruby_module_body(this, result) }
+    final F::BodyStatement getBody() { ruby_module_body(this, result) }
 
     /** Gets the node corresponding to the field `name`. */
-    final AstNode getName() { ruby_module_def(this, result) }
+    final F::AstNode getName() { ruby_module_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_module_body(this, result) or ruby_module_def(this, result)
     }
   }
 
   /** A class representing `next` nodes. */
-  final class Next extends @ruby_next, AstNodeImpl {
+  class Next extends @ruby_next, F::UnderscoreExpression, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Next" }
 
     /** Gets the child of this node. */
-    final ArgumentList getChild() { ruby_next_child(this, result) }
+    final F::ArgumentList getChild() { ruby_next_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_next_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_next_child(this, result) }
   }
 
   /** A class representing `nil` tokens. */
-  final class Nil extends @ruby_token_nil, TokenImpl {
+  class Nil extends @ruby_token_nil, F::Token, F::UnderscoreLhs, F::UnderscorePatternPrimitive {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Nil" }
   }
 
   /** A class representing `operator` tokens. */
-  final class Operator extends @ruby_token_operator, TokenImpl {
+  class Operator extends @ruby_token_operator, F::Token, F::UnderscoreMethodName {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Operator" }
   }
 
   /** A class representing `operator_assignment` nodes. */
-  final class OperatorAssignment extends @ruby_operator_assignment, AstNodeImpl {
+  class OperatorAssignment extends @ruby_operator_assignment, F::UnderscoreArg,
+    F::UnderscoreExpression
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "OperatorAssignment" }
 
     /** Gets the node corresponding to the field `left`. */
-    final UnderscoreLhs getLeft() { ruby_operator_assignment_def(this, result, _, _) }
+    final F::UnderscoreLhs getLeft() { ruby_operator_assignment_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `operator`. */
     final string getOperator() {
@@ -1308,109 +1434,115 @@ module Ruby {
     }
 
     /** Gets the node corresponding to the field `right`. */
-    final AstNode getRight() { ruby_operator_assignment_def(this, _, _, result) }
+    final F::AstNode getRight() { ruby_operator_assignment_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_operator_assignment_def(this, result, _, _) or
       ruby_operator_assignment_def(this, _, _, result)
     }
   }
 
   /** A class representing `optional_parameter` nodes. */
-  final class OptionalParameter extends @ruby_optional_parameter, AstNodeImpl {
+  class OptionalParameter extends @ruby_optional_parameter, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "OptionalParameter" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { ruby_optional_parameter_def(this, result, _) }
+    final F::Identifier getName() { ruby_optional_parameter_def(this, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreArg getValue() { ruby_optional_parameter_def(this, _, result) }
+    final F::UnderscoreArg getValue() { ruby_optional_parameter_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_optional_parameter_def(this, result, _) or ruby_optional_parameter_def(this, _, result)
     }
   }
 
   /** A class representing `pair` nodes. */
-  final class Pair extends @ruby_pair, AstNodeImpl {
+  class Pair extends @ruby_pair, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Pair" }
 
     /** Gets the node corresponding to the field `key`. */
-    final AstNode getKey() { ruby_pair_def(this, result) }
+    final F::AstNode getKey() { ruby_pair_def(this, result) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreArg getValue() { ruby_pair_value(this, result) }
+    final F::UnderscoreArg getValue() { ruby_pair_value(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_pair_def(this, result) or ruby_pair_value(this, result)
     }
   }
 
   /** A class representing `parenthesized_pattern` nodes. */
-  final class ParenthesizedPattern extends @ruby_parenthesized_pattern, AstNodeImpl {
+  class ParenthesizedPattern extends @ruby_parenthesized_pattern, F::UnderscorePatternExprBasic {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ParenthesizedPattern" }
 
     /** Gets the child of this node. */
-    final UnderscorePatternExpr getChild() { ruby_parenthesized_pattern_def(this, result) }
+    final F::UnderscorePatternExpr getChild() { ruby_parenthesized_pattern_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_parenthesized_pattern_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_parenthesized_pattern_def(this, result) }
   }
 
   /** A class representing `parenthesized_statements` nodes. */
-  final class ParenthesizedStatements extends @ruby_parenthesized_statements, AstNodeImpl {
+  class ParenthesizedStatements extends @ruby_parenthesized_statements, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ParenthesizedStatements" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_parenthesized_statements_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_parenthesized_statements_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_parenthesized_statements_child(this, _, result)
     }
   }
 
   /** A class representing `pattern` nodes. */
-  final class Pattern extends @ruby_pattern, AstNodeImpl {
+  class Pattern extends @ruby_pattern, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Pattern" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ruby_pattern_def(this, result) }
+    final F::AstNode getChild() { ruby_pattern_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_pattern_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_pattern_def(this, result) }
   }
 
   /** A class representing `program` nodes. */
-  final class Program extends @ruby_program, AstNodeImpl {
+  class Program extends @ruby_program, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Program" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_program_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_program_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_program_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_program_child(this, _, result) }
   }
 
   /** A class representing `range` nodes. */
-  final class Range extends @ruby_range, AstNodeImpl {
+  class Range extends @ruby_range, F::UnderscoreArg, F::UnderscorePatternExprBasic {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Range" }
 
     /** Gets the node corresponding to the field `begin`. */
-    final AstNode getBegin() { ruby_range_begin(this, result) }
+    final F::AstNode getBegin() { ruby_range_begin(this, result) }
 
     /** Gets the node corresponding to the field `end`. */
-    final AstNode getEnd() { ruby_range_end(this, result) }
+    final F::AstNode getEnd() { ruby_range_end(this, result) }
 
     /** Gets the node corresponding to the field `operator`. */
     final string getOperator() {
@@ -1422,63 +1554,66 @@ module Ruby {
     }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_range_begin(this, result) or ruby_range_end(this, result)
     }
   }
 
   /** A class representing `rational` nodes. */
-  final class Rational extends @ruby_rational, AstNodeImpl {
+  class Rational extends @ruby_rational, F::UnderscoreSimpleNumeric {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Rational" }
 
     /** Gets the child of this node. */
-    final AstNode getChild() { ruby_rational_def(this, result) }
+    final F::AstNode getChild() { ruby_rational_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_rational_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_rational_def(this, result) }
   }
 
   /** A class representing `redo` nodes. */
-  final class Redo extends @ruby_redo, AstNodeImpl {
+  class Redo extends @ruby_redo, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Redo" }
 
     /** Gets the child of this node. */
-    final ArgumentList getChild() { ruby_redo_child(this, result) }
+    final F::ArgumentList getChild() { ruby_redo_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_redo_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_redo_child(this, result) }
   }
 
   /** A class representing `regex` nodes. */
-  final class Regex extends @ruby_regex, AstNodeImpl {
+  class Regex extends @ruby_regex, F::UnderscorePatternPrimitive, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Regex" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_regex_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_regex_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_regex_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_regex_child(this, _, result) }
   }
 
   /** A class representing `rescue` nodes. */
-  final class Rescue extends @ruby_rescue, AstNodeImpl {
+  class Rescue extends @ruby_rescue, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Rescue" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Then getBody() { ruby_rescue_body(this, result) }
+    final F::Then getBody() { ruby_rescue_body(this, result) }
 
     /** Gets the node corresponding to the field `exceptions`. */
-    final Exceptions getExceptions() { ruby_rescue_exceptions(this, result) }
+    final F::Exceptions getExceptions() { ruby_rescue_exceptions(this, result) }
 
     /** Gets the node corresponding to the field `variable`. */
-    final ExceptionVariable getVariable() { ruby_rescue_variable(this, result) }
+    final F::ExceptionVariable getVariable() { ruby_rescue_variable(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_rescue_body(this, result) or
       ruby_rescue_exceptions(this, result) or
       ruby_rescue_variable(this, result)
@@ -1486,147 +1621,158 @@ module Ruby {
   }
 
   /** A class representing `rescue_modifier` nodes. */
-  final class RescueModifier extends @ruby_rescue_modifier, AstNodeImpl {
+  class RescueModifier extends @ruby_rescue_modifier, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "RescueModifier" }
 
     /** Gets the node corresponding to the field `body`. */
-    final AstNode getBody() { ruby_rescue_modifier_def(this, result, _) }
+    final F::AstNode getBody() { ruby_rescue_modifier_def(this, result, _) }
 
     /** Gets the node corresponding to the field `handler`. */
-    final UnderscoreExpression getHandler() { ruby_rescue_modifier_def(this, _, result) }
+    final F::UnderscoreExpression getHandler() { ruby_rescue_modifier_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_rescue_modifier_def(this, result, _) or ruby_rescue_modifier_def(this, _, result)
     }
   }
 
   /** A class representing `rest_assignment` nodes. */
-  final class RestAssignment extends @ruby_rest_assignment, AstNodeImpl {
+  class RestAssignment extends @ruby_rest_assignment, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "RestAssignment" }
 
     /** Gets the child of this node. */
-    final UnderscoreLhs getChild() { ruby_rest_assignment_child(this, result) }
+    final F::UnderscoreLhs getChild() { ruby_rest_assignment_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_rest_assignment_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_rest_assignment_child(this, result) }
   }
 
   /** A class representing `retry` nodes. */
-  final class Retry extends @ruby_retry, AstNodeImpl {
+  class Retry extends @ruby_retry, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Retry" }
 
     /** Gets the child of this node. */
-    final ArgumentList getChild() { ruby_retry_child(this, result) }
+    final F::ArgumentList getChild() { ruby_retry_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_retry_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_retry_child(this, result) }
   }
 
   /** A class representing `return` nodes. */
-  final class Return extends @ruby_return, AstNodeImpl {
+  class Return extends @ruby_return, F::UnderscoreExpression, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Return" }
 
     /** Gets the child of this node. */
-    final ArgumentList getChild() { ruby_return_child(this, result) }
+    final F::ArgumentList getChild() { ruby_return_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_return_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_return_child(this, result) }
   }
 
   /** A class representing `right_assignment_list` nodes. */
-  final class RightAssignmentList extends @ruby_right_assignment_list, AstNodeImpl {
+  class RightAssignmentList extends @ruby_right_assignment_list, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "RightAssignmentList" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_right_assignment_list_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_right_assignment_list_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_right_assignment_list_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() {
+      ruby_right_assignment_list_child(this, _, result)
+    }
   }
 
   /** A class representing `scope_resolution` nodes. */
-  final class ScopeResolution extends @ruby_scope_resolution, AstNodeImpl {
+  class ScopeResolution extends @ruby_scope_resolution, F::UnderscoreLhs,
+    F::UnderscorePatternConstant
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ScopeResolution" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Constant getName() { ruby_scope_resolution_def(this, result) }
+    final F::Constant getName() { ruby_scope_resolution_def(this, result) }
 
     /** Gets the node corresponding to the field `scope`. */
-    final AstNode getScope() { ruby_scope_resolution_scope(this, result) }
+    final F::AstNode getScope() { ruby_scope_resolution_scope(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_scope_resolution_def(this, result) or ruby_scope_resolution_scope(this, result)
     }
   }
 
   /** A class representing `self` tokens. */
-  final class Self extends @ruby_token_self, TokenImpl {
+  class Self extends @ruby_token_self, F::Token, F::UnderscorePatternPrimitive,
+    F::UnderscoreVariable
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Self" }
   }
 
   /** A class representing `setter` nodes. */
-  final class Setter extends @ruby_setter, AstNodeImpl {
+  class Setter extends @ruby_setter, F::UnderscoreMethodName {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Setter" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { ruby_setter_def(this, result) }
+    final F::Identifier getName() { ruby_setter_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_setter_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_setter_def(this, result) }
   }
 
   /** A class representing `simple_symbol` tokens. */
-  final class SimpleSymbol extends @ruby_token_simple_symbol, TokenImpl {
+  class SimpleSymbol extends @ruby_token_simple_symbol, F::Token, F::UnderscoreMethodName,
+    F::UnderscorePatternPrimitive, F::UnderscorePrimary
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SimpleSymbol" }
   }
 
   /** A class representing `singleton_class` nodes. */
-  final class SingletonClass extends @ruby_singleton_class, AstNodeImpl {
+  class SingletonClass extends @ruby_singleton_class, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SingletonClass" }
 
     /** Gets the node corresponding to the field `body`. */
-    final BodyStatement getBody() { ruby_singleton_class_body(this, result) }
+    final F::BodyStatement getBody() { ruby_singleton_class_body(this, result) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreArg getValue() { ruby_singleton_class_def(this, result) }
+    final F::UnderscoreArg getValue() { ruby_singleton_class_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_singleton_class_body(this, result) or ruby_singleton_class_def(this, result)
     }
   }
 
   /** A class representing `singleton_method` nodes. */
-  final class SingletonMethod extends @ruby_singleton_method, AstNodeImpl {
+  class SingletonMethod extends @ruby_singleton_method, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SingletonMethod" }
 
     /** Gets the node corresponding to the field `body`. */
-    final AstNode getBody() { ruby_singleton_method_body(this, result) }
+    final F::AstNode getBody() { ruby_singleton_method_body(this, result) }
 
     /** Gets the node corresponding to the field `name`. */
-    final UnderscoreMethodName getName() { ruby_singleton_method_def(this, result, _) }
+    final F::UnderscoreMethodName getName() { ruby_singleton_method_def(this, result, _) }
 
     /** Gets the node corresponding to the field `object`. */
-    final AstNode getObject() { ruby_singleton_method_def(this, _, result) }
+    final F::AstNode getObject() { ruby_singleton_method_def(this, _, result) }
 
     /** Gets the node corresponding to the field `parameters`. */
-    final MethodParameters getParameters() { ruby_singleton_method_parameters(this, result) }
+    final F::MethodParameters getParameters() { ruby_singleton_method_parameters(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_singleton_method_body(this, result) or
       ruby_singleton_method_def(this, result, _) or
       ruby_singleton_method_def(this, _, result) or
@@ -1635,143 +1781,160 @@ module Ruby {
   }
 
   /** A class representing `splat_argument` nodes. */
-  final class SplatArgument extends @ruby_splat_argument, AstNodeImpl {
+  class SplatArgument extends @ruby_splat_argument, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SplatArgument" }
 
     /** Gets the child of this node. */
-    final UnderscoreArg getChild() { ruby_splat_argument_child(this, result) }
+    final F::UnderscoreArg getChild() { ruby_splat_argument_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_splat_argument_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_splat_argument_child(this, result) }
   }
 
   /** A class representing `splat_parameter` nodes. */
-  final class SplatParameter extends @ruby_splat_parameter, AstNodeImpl {
+  class SplatParameter extends @ruby_splat_parameter, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SplatParameter" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { ruby_splat_parameter_name(this, result) }
+    final F::Identifier getName() { ruby_splat_parameter_name(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_splat_parameter_name(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_splat_parameter_name(this, result) }
   }
 
   /** A class representing `string` nodes. */
-  final class String extends @ruby_string__, AstNodeImpl {
+  class String extends @ruby_string__, F::UnderscorePatternPrimitive, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "String" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_string_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_string_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_string_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_string_child(this, _, result) }
   }
 
   /** A class representing `string_array` nodes. */
-  final class StringArray extends @ruby_string_array, AstNodeImpl {
+  class StringArray extends @ruby_string_array, F::UnderscorePatternPrimitive, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "StringArray" }
 
     /** Gets the `i`th child of this node. */
-    final BareString getChild(int i) { ruby_string_array_child(this, i, result) }
+    final F::BareString getChild(int i) { ruby_string_array_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::BareString getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_string_array_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_string_array_child(this, _, result) }
   }
 
   /** A class representing `string_content` tokens. */
-  final class StringContent extends @ruby_token_string_content, TokenImpl {
+  class StringContent extends @ruby_token_string_content, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "StringContent" }
   }
 
   /** A class representing `subshell` nodes. */
-  final class Subshell extends @ruby_subshell, AstNodeImpl {
+  class Subshell extends @ruby_subshell, F::UnderscorePatternPrimitive, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Subshell" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_subshell_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_subshell_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_subshell_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_subshell_child(this, _, result) }
   }
 
   /** A class representing `super` tokens. */
-  final class Super extends @ruby_token_super, TokenImpl {
+  class Super extends @ruby_token_super, F::Token, F::UnderscoreVariable {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Super" }
   }
 
   /** A class representing `superclass` nodes. */
-  final class Superclass extends @ruby_superclass, AstNodeImpl {
+  class Superclass extends @ruby_superclass, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Superclass" }
 
     /** Gets the child of this node. */
-    final UnderscoreExpression getChild() { ruby_superclass_def(this, result) }
+    final F::UnderscoreExpression getChild() { ruby_superclass_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_superclass_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_superclass_def(this, result) }
   }
 
   /** A class representing `symbol_array` nodes. */
-  final class SymbolArray extends @ruby_symbol_array, AstNodeImpl {
+  class SymbolArray extends @ruby_symbol_array, F::UnderscorePatternPrimitive, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SymbolArray" }
 
     /** Gets the `i`th child of this node. */
-    final BareSymbol getChild(int i) { ruby_symbol_array_child(this, i, result) }
+    final F::BareSymbol getChild(int i) { ruby_symbol_array_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::BareSymbol getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_symbol_array_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_symbol_array_child(this, _, result) }
   }
 
   /** A class representing `test_pattern` nodes. */
-  final class TestPattern extends @ruby_test_pattern, AstNodeImpl {
+  class TestPattern extends @ruby_test_pattern, F::UnderscoreExpression {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TestPattern" }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final UnderscorePatternTopExprBody getPattern() { ruby_test_pattern_def(this, result, _) }
+    final F::UnderscorePatternTopExprBody getPattern() { ruby_test_pattern_def(this, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final UnderscoreArg getValue() { ruby_test_pattern_def(this, _, result) }
+    final F::UnderscoreArg getValue() { ruby_test_pattern_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_test_pattern_def(this, result, _) or ruby_test_pattern_def(this, _, result)
     }
   }
 
   /** A class representing `then` nodes. */
-  final class Then extends @ruby_then, AstNodeImpl {
+  class Then extends @ruby_then, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Then" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { ruby_then_child(this, i, result) }
+    final F::AstNode getChild(int i) { ruby_then_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_then_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_then_child(this, _, result) }
   }
 
   /** A class representing `true` tokens. */
-  final class True extends @ruby_token_true, TokenImpl {
+  class True extends @ruby_token_true, F::Token, F::UnderscoreLhs, F::UnderscorePatternPrimitive {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "True" }
   }
 
   /** A class representing `unary` nodes. */
-  final class Unary extends @ruby_unary, AstNodeImpl {
+  class Unary extends @ruby_unary, F::UnderscoreArg, F::UnderscoreExpression,
+    F::UnderscorePatternPrimitive, F::UnderscorePrimary
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Unary" }
 
     /** Gets the node corresponding to the field `operand`. */
-    final AstNode getOperand() { ruby_unary_def(this, result, _) }
+    final F::AstNode getOperand() { ruby_unary_def(this, result, _) }
 
     /** Gets the node corresponding to the field `operator`. */
     final string getOperator() {
@@ -1791,43 +1954,46 @@ module Ruby {
     }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_unary_def(this, result, _) }
+    final override F::AstNode getAFieldOrChild() { ruby_unary_def(this, result, _) }
   }
 
   /** A class representing `undef` nodes. */
-  final class Undef extends @ruby_undef, AstNodeImpl {
+  class Undef extends @ruby_undef, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Undef" }
 
     /** Gets the `i`th child of this node. */
-    final UnderscoreMethodName getChild(int i) { ruby_undef_child(this, i, result) }
+    final F::UnderscoreMethodName getChild(int i) { ruby_undef_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::UnderscoreMethodName getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_undef_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_undef_child(this, _, result) }
   }
 
   /** A class representing `uninterpreted` tokens. */
-  final class Uninterpreted extends @ruby_token_uninterpreted, TokenImpl {
+  class Uninterpreted extends @ruby_token_uninterpreted, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Uninterpreted" }
   }
 
   /** A class representing `unless` nodes. */
-  final class Unless extends @ruby_unless, AstNodeImpl {
+  class Unless extends @ruby_unless, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Unless" }
 
     /** Gets the node corresponding to the field `alternative`. */
-    final AstNode getAlternative() { ruby_unless_alternative(this, result) }
+    final F::AstNode getAlternative() { ruby_unless_alternative(this, result) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreStatement getCondition() { ruby_unless_def(this, result) }
+    final F::UnderscoreStatement getCondition() { ruby_unless_def(this, result) }
 
     /** Gets the node corresponding to the field `consequence`. */
-    final Then getConsequence() { ruby_unless_consequence(this, result) }
+    final F::Then getConsequence() { ruby_unless_consequence(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_unless_alternative(this, result) or
       ruby_unless_def(this, result) or
       ruby_unless_consequence(this, result)
@@ -1835,147 +2001,154 @@ module Ruby {
   }
 
   /** A class representing `unless_guard` nodes. */
-  final class UnlessGuard extends @ruby_unless_guard, AstNodeImpl {
+  class UnlessGuard extends @ruby_unless_guard, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UnlessGuard" }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreExpression getCondition() { ruby_unless_guard_def(this, result) }
+    final F::UnderscoreExpression getCondition() { ruby_unless_guard_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_unless_guard_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_unless_guard_def(this, result) }
   }
 
   /** A class representing `unless_modifier` nodes. */
-  final class UnlessModifier extends @ruby_unless_modifier, AstNodeImpl {
+  class UnlessModifier extends @ruby_unless_modifier, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UnlessModifier" }
 
     /** Gets the node corresponding to the field `body`. */
-    final UnderscoreStatement getBody() { ruby_unless_modifier_def(this, result, _) }
+    final F::UnderscoreStatement getBody() { ruby_unless_modifier_def(this, result, _) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreExpression getCondition() { ruby_unless_modifier_def(this, _, result) }
+    final F::UnderscoreExpression getCondition() { ruby_unless_modifier_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_unless_modifier_def(this, result, _) or ruby_unless_modifier_def(this, _, result)
     }
   }
 
   /** A class representing `until` nodes. */
-  final class Until extends @ruby_until, AstNodeImpl {
+  class Until extends @ruby_until, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Until" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Do getBody() { ruby_until_def(this, result, _) }
+    final F::Do getBody() { ruby_until_def(this, result, _) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreStatement getCondition() { ruby_until_def(this, _, result) }
+    final F::UnderscoreStatement getCondition() { ruby_until_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_until_def(this, result, _) or ruby_until_def(this, _, result)
     }
   }
 
   /** A class representing `until_modifier` nodes. */
-  final class UntilModifier extends @ruby_until_modifier, AstNodeImpl {
+  class UntilModifier extends @ruby_until_modifier, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UntilModifier" }
 
     /** Gets the node corresponding to the field `body`. */
-    final UnderscoreStatement getBody() { ruby_until_modifier_def(this, result, _) }
+    final F::UnderscoreStatement getBody() { ruby_until_modifier_def(this, result, _) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreExpression getCondition() { ruby_until_modifier_def(this, _, result) }
+    final F::UnderscoreExpression getCondition() { ruby_until_modifier_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_until_modifier_def(this, result, _) or ruby_until_modifier_def(this, _, result)
     }
   }
 
   /** A class representing `variable_reference_pattern` nodes. */
-  final class VariableReferencePattern extends @ruby_variable_reference_pattern, AstNodeImpl {
+  class VariableReferencePattern extends @ruby_variable_reference_pattern,
+    F::UnderscorePatternExprBasic
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "VariableReferencePattern" }
 
     /** Gets the node corresponding to the field `name`. */
-    final AstNode getName() { ruby_variable_reference_pattern_def(this, result) }
+    final F::AstNode getName() { ruby_variable_reference_pattern_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_variable_reference_pattern_def(this, result) }
+    final override F::AstNode getAFieldOrChild() {
+      ruby_variable_reference_pattern_def(this, result)
+    }
   }
 
   /** A class representing `when` nodes. */
-  final class When extends @ruby_when, AstNodeImpl {
+  class When extends @ruby_when, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "When" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Then getBody() { ruby_when_body(this, result) }
+    final F::Then getBody() { ruby_when_body(this, result) }
+
+    /** Gets the node corresponding to the field `pattern`. */
+    final F::Pattern getPattern(int i) { ruby_when_pattern(this, i, result) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern(int i) { ruby_when_pattern(this, i, result) }
+    final F::Pattern getAPattern() { result = this.getPattern(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_when_body(this, result) or ruby_when_pattern(this, _, result)
     }
   }
 
   /** A class representing `while` nodes. */
-  final class While extends @ruby_while, AstNodeImpl {
+  class While extends @ruby_while, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "While" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Do getBody() { ruby_while_def(this, result, _) }
+    final F::Do getBody() { ruby_while_def(this, result, _) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreStatement getCondition() { ruby_while_def(this, _, result) }
+    final F::UnderscoreStatement getCondition() { ruby_while_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_while_def(this, result, _) or ruby_while_def(this, _, result)
     }
   }
 
   /** A class representing `while_modifier` nodes. */
-  final class WhileModifier extends @ruby_while_modifier, AstNodeImpl {
+  class WhileModifier extends @ruby_while_modifier, F::UnderscoreStatement {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "WhileModifier" }
 
     /** Gets the node corresponding to the field `body`. */
-    final UnderscoreStatement getBody() { ruby_while_modifier_def(this, result, _) }
+    final F::UnderscoreStatement getBody() { ruby_while_modifier_def(this, result, _) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final UnderscoreExpression getCondition() { ruby_while_modifier_def(this, _, result) }
+    final F::UnderscoreExpression getCondition() { ruby_while_modifier_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       ruby_while_modifier_def(this, result, _) or ruby_while_modifier_def(this, _, result)
     }
   }
 
   /** A class representing `yield` nodes. */
-  final class Yield extends @ruby_yield, AstNodeImpl {
+  class Yield extends @ruby_yield, F::UnderscoreExpression, F::UnderscorePrimary {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Yield" }
 
     /** Gets the child of this node. */
-    final ArgumentList getChild() { ruby_yield_child(this, result) }
+    final F::ArgumentList getChild() { ruby_yield_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { ruby_yield_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { ruby_yield_child(this, result) }
   }
 
   /** Provides predicates for mapping AST nodes to their named children. */
   module PrintAst {
     /** Gets a child of `node` returned by the member predicate with the given `name`. If the predicate takes an index argument, `i` is bound to that index, otherwise `i` is `-1` (which is never a valid index). */
-    AstNode getChild(AstNode node, string name, int i) {
+    F::AstNode getChild(F::AstNode node, string name, int i) {
       result = node.(Alias).getAlias() and i = -1 and name = "getAlias"
       or
       result = node.(Alias).getName() and i = -1 and name = "getName"
@@ -2307,10 +2480,322 @@ module Ruby {
   }
 }
 
+module RubyFinal {
+  private module F = Ruby;
+
+  import F
+
+  final class AstNode = F::AstNode;
+
+  final class Token = F::Token;
+
+  final class ReservedWord = F::ReservedWord;
+
+  final class UnderscoreArg = F::UnderscoreArg;
+
+  final class UnderscoreCallOperator = F::UnderscoreCallOperator;
+
+  final class UnderscoreExpression = F::UnderscoreExpression;
+
+  final class UnderscoreLhs = F::UnderscoreLhs;
+
+  final class UnderscoreMethodName = F::UnderscoreMethodName;
+
+  final class UnderscoreNonlocalVariable = F::UnderscoreNonlocalVariable;
+
+  final class UnderscorePatternConstant = F::UnderscorePatternConstant;
+
+  final class UnderscorePatternExpr = F::UnderscorePatternExpr;
+
+  final class UnderscorePatternExprBasic = F::UnderscorePatternExprBasic;
+
+  final class UnderscorePatternPrimitive = F::UnderscorePatternPrimitive;
+
+  final class UnderscorePatternTopExprBody = F::UnderscorePatternTopExprBody;
+
+  final class UnderscorePrimary = F::UnderscorePrimary;
+
+  final class UnderscoreSimpleNumeric = F::UnderscoreSimpleNumeric;
+
+  final class UnderscoreStatement = F::UnderscoreStatement;
+
+  final class UnderscoreVariable = F::UnderscoreVariable;
+
+  final class Alias = F::Alias;
+
+  final class AlternativePattern = F::AlternativePattern;
+
+  final class ArgumentList = F::ArgumentList;
+
+  final class Array = F::Array;
+
+  final class ArrayPattern = F::ArrayPattern;
+
+  final class AsPattern = F::AsPattern;
+
+  final class Assignment = F::Assignment;
+
+  final class BareString = F::BareString;
+
+  final class BareSymbol = F::BareSymbol;
+
+  final class Begin = F::Begin;
+
+  final class BeginBlock = F::BeginBlock;
+
+  final class Binary = F::Binary;
+
+  final class Block = F::Block;
+
+  final class BlockArgument = F::BlockArgument;
+
+  final class BlockBody = F::BlockBody;
+
+  final class BlockParameter = F::BlockParameter;
+
+  final class BlockParameters = F::BlockParameters;
+
+  final class BodyStatement = F::BodyStatement;
+
+  final class Break = F::Break;
+
+  final class Call = F::Call;
+
+  final class Case = F::Case;
+
+  final class CaseMatch = F::CaseMatch;
+
+  final class ChainedString = F::ChainedString;
+
+  final class Character = F::Character;
+
+  final class Class = F::Class;
+
+  final class ClassVariable = F::ClassVariable;
+
+  final class Comment = F::Comment;
+
+  final class Complex = F::Complex;
+
+  final class Conditional = F::Conditional;
+
+  final class Constant = F::Constant;
+
+  final class DelimitedSymbol = F::DelimitedSymbol;
+
+  final class DestructuredLeftAssignment = F::DestructuredLeftAssignment;
+
+  final class DestructuredParameter = F::DestructuredParameter;
+
+  final class Do = F::Do;
+
+  final class DoBlock = F::DoBlock;
+
+  final class ElementReference = F::ElementReference;
+
+  final class Else = F::Else;
+
+  final class Elsif = F::Elsif;
+
+  final class EmptyStatement = F::EmptyStatement;
+
+  final class Encoding = F::Encoding;
+
+  final class EndBlock = F::EndBlock;
+
+  final class Ensure = F::Ensure;
+
+  final class EscapeSequence = F::EscapeSequence;
+
+  final class ExceptionVariable = F::ExceptionVariable;
+
+  final class Exceptions = F::Exceptions;
+
+  final class ExpressionReferencePattern = F::ExpressionReferencePattern;
+
+  final class False = F::False;
+
+  final class File = F::File;
+
+  final class FindPattern = F::FindPattern;
+
+  final class Float = F::Float;
+
+  final class For = F::For;
+
+  final class ForwardArgument = F::ForwardArgument;
+
+  final class ForwardParameter = F::ForwardParameter;
+
+  final class GlobalVariable = F::GlobalVariable;
+
+  final class Hash = F::Hash;
+
+  final class HashKeySymbol = F::HashKeySymbol;
+
+  final class HashPattern = F::HashPattern;
+
+  final class HashSplatArgument = F::HashSplatArgument;
+
+  final class HashSplatNil = F::HashSplatNil;
+
+  final class HashSplatParameter = F::HashSplatParameter;
+
+  final class HeredocBeginning = F::HeredocBeginning;
+
+  final class HeredocBody = F::HeredocBody;
+
+  final class HeredocContent = F::HeredocContent;
+
+  final class HeredocEnd = F::HeredocEnd;
+
+  final class Identifier = F::Identifier;
+
+  final class If = F::If;
+
+  final class IfGuard = F::IfGuard;
+
+  final class IfModifier = F::IfModifier;
+
+  final class In = F::In;
+
+  final class InClause = F::InClause;
+
+  final class InstanceVariable = F::InstanceVariable;
+
+  final class Integer = F::Integer;
+
+  final class Interpolation = F::Interpolation;
+
+  final class KeywordParameter = F::KeywordParameter;
+
+  final class KeywordPattern = F::KeywordPattern;
+
+  final class Lambda = F::Lambda;
+
+  final class LambdaParameters = F::LambdaParameters;
+
+  final class LeftAssignmentList = F::LeftAssignmentList;
+
+  final class Line = F::Line;
+
+  final class MatchPattern = F::MatchPattern;
+
+  final class Method = F::Method;
+
+  final class MethodParameters = F::MethodParameters;
+
+  final class Module = F::Module;
+
+  final class Next = F::Next;
+
+  final class Nil = F::Nil;
+
+  final class Operator = F::Operator;
+
+  final class OperatorAssignment = F::OperatorAssignment;
+
+  final class OptionalParameter = F::OptionalParameter;
+
+  final class Pair = F::Pair;
+
+  final class ParenthesizedPattern = F::ParenthesizedPattern;
+
+  final class ParenthesizedStatements = F::ParenthesizedStatements;
+
+  final class Pattern = F::Pattern;
+
+  final class Program = F::Program;
+
+  final class Range = F::Range;
+
+  final class Rational = F::Rational;
+
+  final class Redo = F::Redo;
+
+  final class Regex = F::Regex;
+
+  final class Rescue = F::Rescue;
+
+  final class RescueModifier = F::RescueModifier;
+
+  final class RestAssignment = F::RestAssignment;
+
+  final class Retry = F::Retry;
+
+  final class Return = F::Return;
+
+  final class RightAssignmentList = F::RightAssignmentList;
+
+  final class ScopeResolution = F::ScopeResolution;
+
+  final class Self = F::Self;
+
+  final class Setter = F::Setter;
+
+  final class SimpleSymbol = F::SimpleSymbol;
+
+  final class SingletonClass = F::SingletonClass;
+
+  final class SingletonMethod = F::SingletonMethod;
+
+  final class SplatArgument = F::SplatArgument;
+
+  final class SplatParameter = F::SplatParameter;
+
+  final class String = F::String;
+
+  final class StringArray = F::StringArray;
+
+  final class StringContent = F::StringContent;
+
+  final class Subshell = F::Subshell;
+
+  final class Super = F::Super;
+
+  final class Superclass = F::Superclass;
+
+  final class SymbolArray = F::SymbolArray;
+
+  final class TestPattern = F::TestPattern;
+
+  final class Then = F::Then;
+
+  final class True = F::True;
+
+  final class Unary = F::Unary;
+
+  final class Undef = F::Undef;
+
+  final class Uninterpreted = F::Uninterpreted;
+
+  final class Unless = F::Unless;
+
+  final class UnlessGuard = F::UnlessGuard;
+
+  final class UnlessModifier = F::UnlessModifier;
+
+  final class Until = F::Until;
+
+  final class UntilModifier = F::UntilModifier;
+
+  final class VariableReferencePattern = F::VariableReferencePattern;
+
+  final class When = F::When;
+
+  final class While = F::While;
+
+  final class WhileModifier = F::WhileModifier;
+
+  final class Yield = F::Yield;
+}
+
 overlay[local]
 module Erb {
+  private module F = Erb;
+
   /** The base class for all AST nodes */
-  private class AstNodeImpl extends @erb_ast_node {
+  class AstNode extends @erb_ast_node {
     /** Gets a string representation of this element. */
     string toString() { result = this.getAPrimaryQlClass() }
 
@@ -2318,13 +2803,13 @@ module Erb {
     final L::Location getLocation() { erb_ast_node_location(this, result) }
 
     /** Gets the parent of this element. */
-    final AstNode getParent() { erb_ast_node_parent(this, result, _) }
+    final F::AstNode getParent() { erb_ast_node_parent(this, result, _) }
 
     /** Gets the index of this node among the children of its parent. */
     final int getParentIndex() { erb_ast_node_parent(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    AstNode getAFieldOrChild() { none() }
+    F::AstNode getAFieldOrChild() { none() }
 
     /** Gets the name of the primary QL class for this element. */
     string getAPrimaryQlClass() { result = "???" }
@@ -2333,10 +2818,8 @@ module Erb {
     string getPrimaryQlClasses() { result = concat(this.getAPrimaryQlClass(), ",") }
   }
 
-  final class AstNode = AstNodeImpl;
-
   /** A token. */
-  private class TokenImpl extends @erb_token, AstNodeImpl {
+  class Token extends @erb_token, F::AstNode {
     /** Gets the value of this token. */
     final string getValue() { erb_tokeninfo(this, _, result) }
 
@@ -2347,10 +2830,8 @@ module Erb {
     override string getAPrimaryQlClass() { result = "Token" }
   }
 
-  final class Token = TokenImpl;
-
   /** A reserved word. */
-  final class ReservedWord extends @erb_reserved_word, TokenImpl {
+  class ReservedWord extends @erb_reserved_word, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ReservedWord" }
   }
@@ -2376,87 +2857,90 @@ module Erb {
   }
 
   /** A class representing `code` tokens. */
-  final class Code extends @erb_token_code, TokenImpl {
+  class Code extends @erb_token_code, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Code" }
   }
 
   /** A class representing `comment` tokens. */
-  final class Comment extends @erb_token_comment, TokenImpl {
+  class Comment extends @erb_token_comment, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Comment" }
   }
 
   /** A class representing `comment_directive` nodes. */
-  final class CommentDirective extends @erb_comment_directive, AstNodeImpl {
+  class CommentDirective extends @erb_comment_directive, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CommentDirective" }
 
     /** Gets the child of this node. */
-    final Comment getChild() { erb_comment_directive_child(this, result) }
+    final F::Comment getChild() { erb_comment_directive_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { erb_comment_directive_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { erb_comment_directive_child(this, result) }
   }
 
   /** A class representing `content` tokens. */
-  final class Content extends @erb_token_content, TokenImpl {
+  class Content extends @erb_token_content, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Content" }
   }
 
   /** A class representing `directive` nodes. */
-  final class Directive extends @erb_directive, AstNodeImpl {
+  class Directive extends @erb_directive, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Directive" }
 
     /** Gets the child of this node. */
-    final Code getChild() { erb_directive_child(this, result) }
+    final F::Code getChild() { erb_directive_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { erb_directive_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { erb_directive_child(this, result) }
   }
 
   /** A class representing `graphql_directive` nodes. */
-  final class GraphqlDirective extends @erb_graphql_directive, AstNodeImpl {
+  class GraphqlDirective extends @erb_graphql_directive, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "GraphqlDirective" }
 
     /** Gets the child of this node. */
-    final Code getChild() { erb_graphql_directive_child(this, result) }
+    final F::Code getChild() { erb_graphql_directive_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { erb_graphql_directive_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { erb_graphql_directive_child(this, result) }
   }
 
   /** A class representing `output_directive` nodes. */
-  final class OutputDirective extends @erb_output_directive, AstNodeImpl {
+  class OutputDirective extends @erb_output_directive, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "OutputDirective" }
 
     /** Gets the child of this node. */
-    final Code getChild() { erb_output_directive_child(this, result) }
+    final F::Code getChild() { erb_output_directive_child(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { erb_output_directive_child(this, result) }
+    final override F::AstNode getAFieldOrChild() { erb_output_directive_child(this, result) }
   }
 
   /** A class representing `template` nodes. */
-  final class Template extends @erb_template, AstNodeImpl {
+  class Template extends @erb_template, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Template" }
 
     /** Gets the `i`th child of this node. */
-    final AstNode getChild(int i) { erb_template_child(this, i, result) }
+    final F::AstNode getChild(int i) { erb_template_child(this, i, result) }
+
+    /** Gets the `i`th child of this node. */
+    final F::AstNode getAChild() { result = this.getChild(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { erb_template_child(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { erb_template_child(this, _, result) }
   }
 
   /** Provides predicates for mapping AST nodes to their named children. */
   module PrintAst {
     /** Gets a child of `node` returned by the member predicate with the given `name`. If the predicate takes an index argument, `i` is bound to that index, otherwise `i` is `-1` (which is never a valid index). */
-    AstNode getChild(AstNode node, string name, int i) {
+    F::AstNode getChild(F::AstNode node, string name, int i) {
       result = node.(CommentDirective).getChild() and i = -1 and name = "getChild"
       or
       result = node.(Directive).getChild() and i = -1 and name = "getChild"
@@ -2469,3 +2953,31 @@ module Erb {
     }
   }
 }
+
+module ErbFinal {
+  private module F = Erb;
+
+  import F
+
+  final class AstNode = F::AstNode;
+
+  final class Token = F::Token;
+
+  final class ReservedWord = F::ReservedWord;
+
+  final class Code = F::Code;
+
+  final class Comment = F::Comment;
+
+  final class CommentDirective = F::CommentDirective;
+
+  final class Content = F::Content;
+
+  final class Directive = F::Directive;
+
+  final class GraphqlDirective = F::GraphqlDirective;
+
+  final class OutputDirective = F::OutputDirective;
+
+  final class Template = F::Template;
+}
diff --git a/shared/tree-sitter-extractor/src/generator/mod.rs b/shared/tree-sitter-extractor/src/generator/mod.rs
index dbecf62569af..cf445aaaac7f 100644
--- a/shared/tree-sitter-extractor/src/generator/mod.rs
+++ b/shared/tree-sitter-extractor/src/generator/mod.rs
@@ -18,6 +18,7 @@ pub fn generate(
     languages: Vec<language::Language>,
     dbscheme_path: PathBuf,
     ql_library_path: PathBuf,
+    use_facade_ast: bool,
     regenerate_instructions: &str,
 ) -> std::io::Result<()> {
     let dbscheme_file = File::create(dbscheme_path).map_err(|e| {
@@ -47,6 +48,7 @@ pub fn generate(
     ql::write(
         &mut ql_writer,
         &[ql::TopLevel::Import(ql::Import {
+            is_private: false,
             module: "codeql.Locations",
             alias: Some("L"),
         })],
@@ -122,17 +124,35 @@ pub fn generate(
 
         let mut body = vec![];
 
-        for c in ql_gen::create_ast_node_class(
+        let facade_import_name = if use_facade_ast {
+            format!("FacadeAst::{}", &language.name)
+        } else {
+            language.name.clone() // If not using a facade AST, treat the module itself as the facade module.
+        };
+        if use_facade_ast {
+            body.push(ql::TopLevel::Import(ql::Import {
+                is_private: true,
+                module: &facade_import_name,
+                alias: Some("F"),
+            }));
+        } else {
+            body.push(ql::TopLevel::ModuleAlias(ql::ModuleAlias {
+                is_private: true,
+                name: "F",
+                target: &language.name,
+            }));
+        }
+
+        body.push(ql::TopLevel::Class(ql_gen::create_ast_node_class(
             &ast_node_name,
             &node_location_table_name,
             &node_parent_table_name,
-        ) {
-            body.push(ql::TopLevel::Class(c));
-        }
+        )));
 
-        for c in ql_gen::create_token_class(&token_name, &tokeninfo_name) {
-            body.push(ql::TopLevel::Class(c));
-        }
+        body.push(ql::TopLevel::Class(ql_gen::create_token_class(
+            &token_name,
+            &tokeninfo_name,
+        )));
 
         if has_trivia_tokens {
             body.push(ql::TopLevel::Class(ql_gen::create_trivia_token_class(
@@ -166,14 +186,68 @@ pub fn generate(
 
         body.append(&mut ql_gen::convert_nodes(&nodes));
         body.push(ql_gen::create_print_ast_module(&nodes));
+        let mut final_body = if use_facade_ast {
+            vec![
+                ql::TopLevel::Import(ql::Import {
+                    is_private: true,
+                    module: &facade_import_name,
+                    alias: Some("F"),
+                }),
+                ql::TopLevel::Import(ql::Import {
+                    is_private: false,
+                    module: "F",
+                    alias: None,
+                }),
+            ]
+        } else {
+            vec![
+                ql::TopLevel::ModuleAlias(ql::ModuleAlias {
+                    is_private: true,
+                    name: "F",
+                    target: &language.name,
+                }),
+                ql::TopLevel::Import(ql::Import {
+                    is_private: false,
+                    module: "F",
+                    alias: None,
+                }),
+            ]
+        };
+        let final_aliases = body
+            .iter()
+            .filter_map(|decl| match decl {
+                ql::TopLevel::Class(c) => Some(ql::TopLevel::Class(ql::Class {
+                    qldoc: None,
+                    name: c.name,
+                    is_abstract: false,
+                    is_final: true,
+                    is_private: false,
+                    supertypes: Set::new(),
+                    characteristic_predicate: None,
+                    predicates: vec![],
+                    alias: Some(format!("F::{}", c.name)),
+                })),
+                _ => None,
+            })
+            .collect::<Vec<_>>();
+        final_body.extend(final_aliases);
+        let final_module_name = format!("{}Final", language.name);
         ql::write(
             &mut ql_writer,
-            &[ql::TopLevel::Module(ql::Module {
-                qldoc: None,
-                name: &language.name,
-                body,
-                overlay: Some(ql::OverlayAnnotation::Local),
-            })],
+            &[
+                ql::TopLevel::Module(ql::Module {
+                    qldoc: None,
+                    name: &language.name,
+                    body,
+                    overlay: Some(ql::OverlayAnnotation::Local),
+                }),
+                ql::TopLevel::Module(ql::Module {
+                    qldoc: None,
+                    name: &final_module_name,
+                    body: final_body,
+                    overlay: None,
+                }),
+            ],
         )?;
     }
     Ok(())
diff --git a/shared/tree-sitter-extractor/src/generator/ql.rs b/shared/tree-sitter-extractor/src/generator/ql.rs
index 6a78a4f95f09..f114e251af21 100644
--- a/shared/tree-sitter-extractor/src/generator/ql.rs
+++ b/shared/tree-sitter-extractor/src/generator/ql.rs
@@ -5,6 +5,7 @@ use std::fmt;
 pub enum TopLevel<'a> {
     Class(Class<'a>),
     Import(Import<'a>),
+    ModuleAlias(ModuleAlias<'a>),
     Module(Module<'a>),
     Predicate(Predicate<'a>),
 }
@@ -14,20 +15,41 @@ impl fmt::Display for TopLevel<'_> {
         match self {
             TopLevel::Import(imp) => write!(f, "{imp}"),
             TopLevel::Class(cls) => write!(f, "{cls}"),
+            TopLevel::ModuleAlias(alias) => write!(f, "{alias}"),
             TopLevel::Module(m) => write!(f, "{m}"),
             TopLevel::Predicate(pred) => write!(f, "{pred}"),
         }
     }
 }
 
+#[derive(Clone, Eq, PartialEq, Hash)]
+pub struct ModuleAlias<'a> {
+    pub is_private: bool,
+    pub name: &'a str,
+    pub target: &'a str,
+}
+
+impl fmt::Display for ModuleAlias<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        if self.is_private {
+            write!(f, "private ")?;
+        }
+        write!(f, "module {} = {};", self.name, self.target)
+    }
+}
+
 #[derive(Clone, Eq, PartialEq, Hash)]
 pub struct Import<'a> {
+    pub is_private: bool,
     pub module: &'a str,
     pub alias: Option<&'a str>,
 }
 
 impl fmt::Display for Import<'_> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        if self.is_private {
+            write!(f, "private ")?;
+        }
         write!(f, "import {}", &self.module)?;
         if let Some(name) = &self.alias {
             write!(f, " as {name}")?;
@@ -146,6 +168,9 @@ pub enum Type<'a> {
 
     /// A user-defined type.
     Normal(&'a str),
+
+    /// A normal type with an `F::` prefix.
+    Facade(&'a str),
 }
 
 impl fmt::Display for Type<'_> {
@@ -155,6 +180,7 @@ impl fmt::Display for Type<'_> {
             Type::String => write!(f, "string"),
             Type::Normal(name) => write!(f, "{name}"),
             Type::At(name) => write!(f, "@{name}"),
+            Type::Facade(name) => write!(f, "F::{name}"),
         }
     }
 }
diff --git a/shared/tree-sitter-extractor/src/generator/ql_gen.rs b/shared/tree-sitter-extractor/src/generator/ql_gen.rs
index 8f37bf5dff45..fe6f9a2a828b 100644
--- a/shared/tree-sitter-extractor/src/generator/ql_gen.rs
+++ b/shared/tree-sitter-extractor/src/generator/ql_gen.rs
@@ -8,7 +8,7 @@ pub fn create_ast_node_class<'a>(
     ast_node: &'a str,
     node_location_table: &'a str,
     node_parent_table: &'a str,
-) -> [ql::Class<'a>; 2] {
+) -> ql::Class<'a> {
     // Default implementation of `toString` calls `this.getAPrimaryQlClass()`
     let to_string = ql::Predicate {
         qldoc: Some(String::from(
@@ -48,7 +48,7 @@ pub fn create_ast_node_class<'a>(
         Some(String::from("Gets a field or child node of this node.")),
         "getAFieldOrChild",
         false,
-        Some(ql::Type::Normal("AstNode")),
+        Some(ql::Type::Facade("AstNode")),
     );
     let get_parent = ql::Predicate {
         qldoc: Some(String::from("Gets the parent of this element.")),
@@ -56,7 +56,7 @@ pub fn create_ast_node_class<'a>(
         overridden: false,
         is_private: false,
         is_final: true,
-        return_type: Some(ql::Type::Normal("AstNode")),
+        return_type: Some(ql::Type::Facade("AstNode")),
         formal_parameters: vec![],
         body: ql::Expression::Pred(
             node_parent_table,
@@ -132,41 +132,28 @@ pub fn create_ast_node_class<'a>(
         ),
         overlay: None,
     };
-    [
-        ql::Class {
-            qldoc: Some(String::from("The base class for all AST nodes")),
-            name: "AstNodeImpl",
-            is_abstract: false,
-            is_final: false,
-            is_private: true,
-            alias: None,
-            supertypes: vec![ql::Type::At(ast_node)].into_iter().collect(),
-            characteristic_predicate: None,
-            predicates: vec![
-                to_string,
-                get_location,
-                get_parent,
-                get_parent_index,
-                get_a_field_or_child,
-                get_a_primary_ql_class,
-                get_primary_ql_classes,
-            ],
-        },
-        ql::Class {
-            qldoc: None,
-            name: "AstNode",
-            is_abstract: false,
-            is_final: true,
-            is_private: false,
-            alias: Some("AstNodeImpl".to_string()),
-            supertypes: vec![].into_iter().collect(),
-            characteristic_predicate: None,
-            predicates: vec![],
-        },
-    ]
+    ql::Class {
+        qldoc: Some(String::from("The base class for all AST nodes")),
+        name: "AstNode",
+        is_abstract: false,
+        is_final: false,
+        is_private: false,
+        alias: None,
+        supertypes: vec![ql::Type::At(ast_node)].into_iter().collect(),
+        characteristic_predicate: None,
+        predicates: vec![
+            to_string,
+            get_location,
+            get_parent,
+            get_parent_index,
+            get_a_field_or_child,
+            get_a_primary_ql_class,
+            get_primary_ql_classes,
+        ],
+    }
 }
 
-pub fn create_token_class<'a>(token_type: &'a str, tokeninfo: &'a str) -> [ql::Class<'a>; 2] {
+pub fn create_token_class<'a>(token_type: &'a str, tokeninfo: &'a str) -> ql::Class<'a> {
     let tokeninfo_arity = 3; // id, kind, value
     let get_value = ql::Predicate {
         qldoc: Some(String::from("Gets the value of this token.")),
@@ -199,36 +186,23 @@ pub fn create_token_class<'a>(token_type: &'a str, tokeninfo: &'a str) -> [ql::C
         ),
         overlay: None,
     };
-    [
-        ql::Class {
-            qldoc: Some(String::from("A token.")),
-            name: "TokenImpl",
-            is_abstract: false,
-            is_final: false,
-            is_private: true,
-            alias: None,
-            supertypes: vec![ql::Type::At(token_type), ql::Type::Normal("AstNodeImpl")]
-                .into_iter()
-                .collect(),
-            characteristic_predicate: None,
-            predicates: vec![
-                get_value,
-                to_string,
-                create_get_a_primary_ql_class("Token", false),
-            ],
-        },
-        ql::Class {
-            qldoc: None,
-            name: "Token",
-            is_abstract: false,
-            is_final: true,
-            is_private: false,
-            alias: Some("TokenImpl".to_string()),
-            supertypes: vec![].into_iter().collect(),
-            characteristic_predicate: None,
-            predicates: vec![],
-        },
-    ]
+    ql::Class {
+        qldoc: Some(String::from("A token.")),
+        name: "Token",
+        is_abstract: false,
+        is_final: false,
+        is_private: false,
+        alias: None,
+        supertypes: vec![ql::Type::At(token_type), ql::Type::Facade("AstNode")]
+            .into_iter()
+            .collect(),
+        characteristic_predicate: None,
+        predicates: vec![
+            get_value,
+            to_string,
+            create_get_a_primary_ql_class("Token", false),
+        ],
+    }
 }
 
 /// Creates the `TriviaToken` class. Trivia tokens (e.g. comments) are
@@ -283,15 +257,12 @@ pub fn create_trivia_token_class<'a>(
         )),
         name: "TriviaToken",
         is_abstract: false,
-        is_final: true,
+        is_final: false,
         is_private: false,
         alias: None,
-        supertypes: vec![
-            ql::Type::At(trivia_token_type),
-            ql::Type::Normal("AstNodeImpl"),
-        ]
-        .into_iter()
-        .collect(),
+        supertypes: vec![ql::Type::At(trivia_token_type), ql::Type::Facade("AstNode")]
+            .into_iter()
+            .collect(),
         characteristic_predicate: None,
         predicates: vec![
             get_value,
@@ -309,10 +280,10 @@ pub fn create_reserved_word_class(db_name: &str) -> ql::Class<'_> {
         qldoc: Some(String::from("A reserved word.")),
         name: class_name,
         is_abstract: false,
-        is_final: true,
+        is_final: false,
         is_private: false,
         alias: None,
-        supertypes: vec![ql::Type::At(db_name), ql::Type::Normal("TokenImpl")]
+        supertypes: vec![ql::Type::At(db_name), ql::Type::Facade("Token")]
             .into_iter()
             .collect(),
         characteristic_predicate: None,
@@ -635,10 +606,11 @@ fn create_get_field_expr_for_table_storage<'a>(
     )
 }
 
-/// Creates a pair consisting of a predicate to get the given field, and an
-/// optional expression that will get the same field. When the field can occur
-/// multiple times, the predicate will take an index argument, while the
-/// expression will use the "don't care" expression to hold for all occurrences.
+/// Creates a list of predicates to get the given field, and an optional
+/// expression that will get the same field. When the field can occur multiple
+/// times, this includes an indexed getter and a convenience getter that returns
+/// any member; the expression uses the "don't care" expression to hold for all
+/// occurrences.
 ///
 /// # Arguments
 ///
@@ -656,16 +628,16 @@ fn create_field_getters<'a>(
     main_table_column_index: &mut usize,
     field: &'a node_types::Field,
     nodes: &'a node_types::NodeTypeMap,
-) -> (ql::Predicate<'a>, Option<ql::Expression<'a>>) {
+) -> (Vec<ql::Predicate<'a>>, Option<ql::Expression<'a>>) {
     let return_type = match &field.type_info {
         node_types::FieldTypeInfo::Single(t) => {
-            Some(ql::Type::Normal(&nodes.get(t).unwrap().ql_class_name))
+            Some(ql::Type::Facade(&nodes.get(t).unwrap().ql_class_name))
         }
         node_types::FieldTypeInfo::Multiple {
             types: _,
             dbscheme_union: _,
             ql_class,
-        } => Some(ql::Type::Normal(ql_class)),
+        } => Some(ql::Type::Facade(ql_class)),
         node_types::FieldTypeInfo::ReservedWordInt(_) => Some(ql::Type::String),
     };
     let formal_parameters = match &field.storage {
@@ -780,26 +752,87 @@ fn create_field_getters<'a>(
             }
         }
     };
-    (
-        ql::Predicate {
-            qldoc: Some(qldoc),
-            name: &field.getter_name,
+    let mut predicates = vec![ql::Predicate {
+        qldoc: Some(qldoc.clone()),
+        name: &field.getter_name,
+        overridden: false,
+        is_private: false,
+        is_final: true,
+        return_type: return_type.clone(),
+        formal_parameters,
+        body,
+        overlay: None,
+    }];
+
+    if let Some(any_getter_name) = &field.any_getter_name {
+        predicates.push(ql::Predicate {
+            qldoc: Some(qldoc.clone()),
+            name: any_getter_name,
             overridden: false,
             is_private: false,
             is_final: true,
             return_type,
-            formal_parameters,
-            body,
+            formal_parameters: vec![],
+            body: ql::Expression::Equals(
+                Box::new(ql::Expression::Var("result")),
+                Box::new(ql::Expression::Dot(
+                    Box::new(ql::Expression::Var("this")),
+                    &field.getter_name,
+                    vec![ql::Expression::Var("_")],
+                )),
+            ),
             overlay: None,
-        },
-        optional_expr,
-    )
+        });
+    }
+
+    (predicates, optional_expr)
+}
+
+fn compute_direct_supertypes(
+    nodes: &node_types::NodeTypeMap,
+) -> std::collections::BTreeMap<node_types::TypeName, BTreeSet<&str>> {
+    let mut supertypes = std::collections::BTreeMap::new();
+    for node in nodes.values() {
+        if let node_types::EntryKind::Union { members } = &node.kind {
+            for member in members {
+                supertypes
+                    .entry(member.clone())
+                    .or_insert_with(BTreeSet::new)
+                    .insert(node.ql_class_name.as_str());
+            }
+        }
+    }
+    supertypes
+}
+
+fn ast_base_types<'a>(
+    type_name: &node_types::TypeName,
+    direct_supertypes: &std::collections::BTreeMap<node_types::TypeName, BTreeSet<&'a str>>,
+) -> BTreeSet<ql::Type<'a>> {
+    match direct_supertypes.get(type_name) {
+        Some(supertypes) if !supertypes.is_empty() => supertypes
+            .iter()
+            .map(|name| ql::Type::Facade(name))
+            .collect(),
+        _ => vec![ql::Type::Facade("AstNode")].into_iter().collect(),
+    }
+}
+
+fn class_supertypes<'a>(
+    type_name: &node_types::TypeName,
+    dbscheme_name: &'a str,
+    direct_supertypes: &std::collections::BTreeMap<node_types::TypeName, BTreeSet<&'a str>>,
+) -> BTreeSet<ql::Type<'a>> {
+    let mut supertypes = ast_base_types(type_name, direct_supertypes);
+    supertypes.insert(ql::Type::At(dbscheme_name));
+    supertypes
 }
 
 /// Converts the given node types into CodeQL classes wrapping the dbscheme.
 pub fn convert_nodes(nodes: &node_types::NodeTypeMap) -> Vec<ql::TopLevel<'_>> {
     let mut classes = Vec::new();
     let mut token_kinds = BTreeSet::new();
+    let direct_supertypes = compute_direct_supertypes(nodes);
     for (type_name, node) in nodes {
         if let node_types::EntryKind::Token { .. } = &node.kind {
             if type_name.named {
@@ -814,14 +847,14 @@ pub fn convert_nodes(nodes: &node_types::NodeTypeMap) -> Vec<ql::TopLevel<'_>> {
                 if type_name.named {
                     let get_a_primary_ql_class =
                         create_get_a_primary_ql_class(&node.ql_class_name, true);
-                    let mut supertypes: BTreeSet<ql::Type> = BTreeSet::new();
-                    supertypes.insert(ql::Type::At(&node.dbscheme_name));
-                    supertypes.insert(ql::Type::Normal("TokenImpl"));
+                    let mut supertypes =
+                        class_supertypes(type_name, &node.dbscheme_name, &direct_supertypes);
+                    supertypes.insert(ql::Type::Facade("Token"));
                     classes.push(ql::TopLevel::Class(ql::Class {
                         qldoc: Some(format!("A class representing `{}` tokens.", type_name.kind)),
                         name: &node.ql_class_name,
                         is_abstract: false,
-                        is_final: true,
+                        is_final: false,
                         is_private: false,
                         alias: None,
                         supertypes,
@@ -837,15 +870,14 @@ pub fn convert_nodes(nodes: &node_types::NodeTypeMap) -> Vec<ql::TopLevel<'_>> {
                     qldoc: None,
                     name: &node.ql_class_name,
                     is_abstract: false,
-                    is_final: true,
+                    is_final: false,
                     is_private: false,
                     alias: None,
-                    supertypes: vec![
-                        ql::Type::At(&node.dbscheme_name),
-                        ql::Type::Normal("AstNodeImpl"),
-                    ]
-                    .into_iter()
-                    .collect(),
+                    supertypes: class_supertypes(
+                        type_name,
+                        &node.dbscheme_name,
+                        &direct_supertypes,
+                    ),
                     characteristic_predicate: None,
                     predicates: vec![],
                 }));
@@ -871,15 +903,14 @@ pub fn convert_nodes(nodes: &node_types::NodeTypeMap) -> Vec<ql::TopLevel<'_>> {
                     qldoc: Some(format!("A class representing `{}` nodes.", type_name.kind)),
                     name: main_class_name,
                     is_abstract: false,
-                    is_final: true,
+                    is_final: false,
                     is_private: false,
                     alias: None,
-                    supertypes: vec![
-                        ql::Type::At(&node.dbscheme_name),
-                        ql::Type::Normal("AstNodeImpl"),
-                    ]
-                    .into_iter()
-                    .collect(),
+                    supertypes: class_supertypes(
+                        type_name,
+                        &node.dbscheme_name,
+                        &direct_supertypes,
+                    ),
                     characteristic_predicate: None,
                     predicates: vec![create_get_a_primary_ql_class(main_class_name, true)],
                 };
@@ -892,14 +923,14 @@ pub fn convert_nodes(nodes: &node_types::NodeTypeMap) -> Vec<ql::TopLevel<'_>> {
                 // - predicates to access the fields,
                 // - the QL expressions to access the fields that will be part of getAFieldOrChild.
                 for field in fields {
-                    let (get_pred, get_child_expr) = create_field_getters(
+                    let (get_preds, get_child_expr) = create_field_getters(
                         main_table_name,
                         main_table_arity,
                         &mut main_table_column_index,
                         field,
                         nodes,
                     );
-                    main_class.predicates.push(get_pred);
+                    main_class.predicates.extend(get_preds);
                     if let Some(get_child_expr) = get_child_expr {
                         get_child_exprs.push(get_child_expr)
                     }
@@ -911,7 +942,7 @@ pub fn convert_nodes(nodes: &node_types::NodeTypeMap) -> Vec<ql::TopLevel<'_>> {
                     overridden: true,
                     is_private: false,
                     is_final: true,
-                    return_type: Some(ql::Type::Normal("AstNode")),
+                    return_type: Some(ql::Type::Facade("AstNode")),
                     formal_parameters: vec![],
                     body: ql::Expression::Or(get_child_exprs),
                     overlay: None,
@@ -992,11 +1023,11 @@ pub fn create_print_ast_module(nodes: &node_types::NodeTypeMap) -> ql::TopLevel<
         overridden: false,
         is_private: false,
         is_final: false,
-        return_type: Some(ql::Type::Normal("AstNode")),
+        return_type: Some(ql::Type::Facade("AstNode")),
         formal_parameters: vec![
             ql::FormalParameter {
                 name: "node",
-                param_type: ql::Type::Normal("AstNode"),
+                param_type: ql::Type::Facade("AstNode"),
             },
             ql::FormalParameter {
                 name: "name",
diff --git a/shared/tree-sitter-extractor/src/node_types.rs b/shared/tree-sitter-extractor/src/node_types.rs
index 7a457fa73f0d..4c67c2e4f20e 100644
--- a/shared/tree-sitter-extractor/src/node_types.rs
+++ b/shared/tree-sitter-extractor/src/node_types.rs
@@ -22,7 +22,7 @@ pub enum EntryKind {
     Token { kind_id: usize },
 }
 
-#[derive(Debug, Ord, PartialOrd, Eq, PartialEq)]
+#[derive(Clone, Debug, Ord, PartialOrd, Eq, PartialEq)]
 pub struct TypeName {
     pub kind: String,
     pub named: bool,
@@ -56,6 +56,9 @@ pub struct Field {
     pub name: Option<String>,
     /// The name of the predicate to get this field.
     pub getter_name: String,
+    /// For plural fields, the name of a convenience getter that returns
+    /// any member (for example `getAnArgument` for `getArgument(i)`).
+    pub any_getter_name: Option<String>,
     pub storage: Storage,
 }
 
@@ -281,6 +284,16 @@ fn add_field(
         "get{}",
         dbscheme_name_to_class_name(&escape_name(&name_for_field_or_child(&field_name)))
     );
+    let getter_suffix = getter_name.strip_prefix("get").unwrap_or(&getter_name);
+    let article = match getter_suffix.chars().next().map(|c| c.to_ascii_lowercase()) {
+        Some('a' | 'e' | 'i' | 'o' | 'u') => "An",
+        _ => "A",
+    };
+    let any_getter_name = if field_info.multiple {
+        Some(format!("get{article}{getter_suffix}"))
+    } else {
+        None
+    };
     fields.push(Field {
         parent: TypeName {
             kind: parent_type_name.kind.to_string(),
@@ -289,6 +302,7 @@ fn add_field(
         type_info,
         name: field_name,
         getter_name,
+        any_getter_name,
         storage,
     });
 }
diff --git a/shared/yeast-macros/src/parse.rs b/shared/yeast-macros/src/parse.rs
index 40f9dbce61c8..34e859c912e9 100644
--- a/shared/yeast-macros/src/parse.rs
+++ b/shared/yeast-macros/src/parse.rs
@@ -157,11 +157,14 @@ fn parse_query_fields(tokens: &mut Tokens) -> Result<Vec<TokenStream>> {
                            map: &mut std::collections::HashMap<String, Vec<TokenStream>>,
                            name: String,
                            elem: TokenStream| {
-        if !map.contains_key(&name) {
-            order.push(name.clone());
-            map.insert(name, vec![elem]);
-        } else {
-            map.get_mut(&name).unwrap().push(elem);
+        match map.entry(name) {
+            std::collections::hash_map::Entry::Occupied(mut entry) => {
+                entry.get_mut().push(elem);
+            }
+            std::collections::hash_map::Entry::Vacant(entry) => {
+                order.push(entry.key().clone());
+                entry.insert(vec![elem]);
+            }
         }
     };
     while tokens.peek().is_some() {
diff --git a/shared/yeast/src/dump.rs b/shared/yeast/src/dump.rs
index dc348f8789b6..0e2e57e6f82a 100644
--- a/shared/yeast/src/dump.rs
+++ b/shared/yeast/src/dump.rs
@@ -2,6 +2,13 @@ use std::fmt::Write;
 
 use crate::{schema::Schema, Ast, Id, Node, NodeContent, CHILD_FIELD};
 
+#[derive(Clone, Copy)]
+struct TypeCheckContext<'a> {
+    schema: &'a Schema,
+    expected: Option<&'a [crate::schema::NodeType]>,
+    parent_field: Option<(&'a str, &'a str)>,
+}
+
 /// Options for controlling AST dump output.
 pub struct DumpOptions {
     /// Whether to include source locations in the output.
@@ -70,7 +77,11 @@ pub fn dump_ast_with_type_errors_and_options(
         source,
         options,
         0,
-        Some((schema, None, None)),
+        Some(TypeCheckContext {
+            schema,
+            expected: None,
+            parent_field: None,
+        }),
         &mut out,
     );
     out
@@ -179,11 +190,7 @@ fn dump_node(
     source: &str,
     options: &DumpOptions,
     indent: usize,
-    type_check: Option<(
-        &Schema,
-        Option<&[crate::schema::NodeType]>,
-        Option<(&str, &str)>,
-    )>,
+    type_check: Option<TypeCheckContext<'_>>,
     out: &mut String,
 ) {
     let node = match ast.get_node(id) {
@@ -219,8 +226,10 @@ fn dump_node(
         }
     }
 
-    if let Some((schema, expected, parent_field)) = type_check {
-        if let Some(err) = type_error_for_node(schema, node, expected, parent_field) {
+    if let Some(context) = type_check {
+        if let Some(err) =
+            type_error_for_node(context.schema, node, context.expected, context.parent_field)
+        {
             write!(out, " <-- ERROR: {err}").unwrap();
         }
     }
@@ -242,10 +251,11 @@ fn dump_node(
             .copied()
             .filter(|&f| f != CHILD_FIELD)
             .collect();
-        match type_check.and_then(|(schema, _, _)| {
-            schema
+        match type_check.and_then(|context| {
+            context
+                .schema
                 .field_order(node.kind_name())
-                .map(|order| (schema, order))
+                .map(|order| (context.schema, order))
         }) {
             Some((schema, order)) => {
                 let mut result: Vec<u16> = order
@@ -267,11 +277,15 @@ fn dump_node(
     for field_id in named_field_ids {
         let children = &node.fields[&field_id];
         let field_name = ast.field_name_for_id(field_id).unwrap_or("?");
-        let child_type_check = type_check.map(|(schema, _, _)| {
-            let expected = expected_for_field(schema, node.kind_name(), field_name)
+        let child_type_check = type_check.map(|context| {
+            let expected = expected_for_field(context.schema, node.kind_name(), field_name)
                 .or(Some(EMPTY_NODE_TYPES));
             let parent_field = Some((node.kind_name(), field_name));
-            (schema, expected, parent_field)
+            TypeCheckContext {
+                schema: context.schema,
+                expected,
+                parent_field,
+            }
         });
 
         if children.len() == 1 {
@@ -310,8 +324,8 @@ fn dump_node(
     }
 
     // Check for required fields that are absent
-    if let Some((schema, _, _)) = type_check {
-        for (_field_id, field_name) in schema.required_fields_for_kind(node.kind_name()) {
+    if let Some(context) = type_check {
+        for (_field_id, field_name) in context.schema.required_fields_for_kind(node.kind_name()) {
             let present = match field_name {
                 Some(n) => ast
                     .field_id_for_name(n)
@@ -327,13 +341,18 @@ fn dump_node(
 
     // Unnamed children — skip unnamed tokens (keywords, punctuation)
     if let Some(children) = node.fields.get(&CHILD_FIELD) {
-        let child_type_check = type_check.map(|(schema, _, _)| {
-            let expected = schema
+        let child_type_check = type_check.map(|context| {
+            let expected = context
+                .schema
                 .field_types(node.kind_name(), CHILD_FIELD)
                 .map(|v| v.as_slice())
                 .or(Some(EMPTY_NODE_TYPES));
             let parent_field = Some((node.kind_name(), "children"));
-            (schema, expected, parent_field)
+            TypeCheckContext {
+                schema: context.schema,
+                expected,
+                parent_field,
+            }
         });
         for &child_id in children {
             if let Some(child) = ast.get_node(child_id) {
@@ -359,11 +378,7 @@ fn dump_node_inline(
     id: Id,
     source: &str,
     options: &DumpOptions,
-    type_check: Option<(
-        &Schema,
-        Option<&[crate::schema::NodeType]>,
-        Option<(&str, &str)>,
-    )>,
+    type_check: Option<TypeCheckContext<'_>>,
     out: &mut String,
 ) {
     let node = match ast.get_node(id) {
@@ -394,8 +409,10 @@ fn dump_node_inline(
         }
     }
 
-    if let Some((schema, expected, parent_field)) = type_check {
-        if let Some(err) = type_error_for_node(schema, node, expected, parent_field) {
+    if let Some(context) = type_check {
+        if let Some(err) =
+            type_error_for_node(context.schema, node, context.expected, context.parent_field)
+        {
             write!(out, " <-- ERROR: {err}").unwrap();
         }
     }
diff --git a/unified/extractor/src/generator.rs b/unified/extractor/src/generator.rs
index 974de5dbca97..f1f8a34ca84d 100644
--- a/unified/extractor/src/generator.rs
+++ b/unified/extractor/src/generator.rs
@@ -35,6 +35,7 @@ pub fn run(options: Options) -> std::io::Result<()> {
         languages,
         options.dbscheme,
         options.library,
+        true, // use facade AST
         "run unified/scripts/create-extractor-pack.sh",
     )
 }
diff --git a/unified/ql/lib/codeql/unified/Ast.qll b/unified/ql/lib/codeql/unified/internal/Ast.qll
similarity index 62%
rename from unified/ql/lib/codeql/unified/Ast.qll
rename to unified/ql/lib/codeql/unified/internal/Ast.qll
index 4ad61ff353bf..20ff74e6eaf7 100644
--- a/unified/ql/lib/codeql/unified/Ast.qll
+++ b/unified/ql/lib/codeql/unified/internal/Ast.qll
@@ -25,8 +25,10 @@ private predicate discardLocation(@location_default loc) {
 
 overlay[local]
 module Unified {
+  private import FacadeAst::Unified as F
+
   /** The base class for all AST nodes */
-  private class AstNodeImpl extends @unified_ast_node {
+  class AstNode extends @unified_ast_node {
     /** Gets a string representation of this element. */
     string toString() { result = this.getAPrimaryQlClass() }
 
@@ -34,13 +36,13 @@ module Unified {
     final L::Location getLocation() { unified_ast_node_location(this, result) }
 
     /** Gets the parent of this element. */
-    final AstNode getParent() { unified_ast_node_parent(this, result, _) }
+    final F::AstNode getParent() { unified_ast_node_parent(this, result, _) }
 
     /** Gets the index of this node among the children of its parent. */
     final int getParentIndex() { unified_ast_node_parent(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    AstNode getAFieldOrChild() { none() }
+    F::AstNode getAFieldOrChild() { none() }
 
     /** Gets the name of the primary QL class for this element. */
     string getAPrimaryQlClass() { result = "???" }
@@ -49,10 +51,8 @@ module Unified {
     string getPrimaryQlClasses() { result = concat(this.getAPrimaryQlClass(), ",") }
   }
 
-  final class AstNode = AstNodeImpl;
-
   /** A token. */
-  private class TokenImpl extends @unified_token, AstNodeImpl {
+  class Token extends @unified_token, F::AstNode {
     /** Gets the value of this token. */
     final string getValue() { unified_tokeninfo(this, _, result) }
 
@@ -63,10 +63,8 @@ module Unified {
     override string getAPrimaryQlClass() { result = "Token" }
   }
 
-  final class Token = TokenImpl;
-
   /** A trivia token, such as a comment, preserved from the original parse tree. */
-  final class TriviaToken extends @unified_trivia_token, AstNodeImpl {
+  class TriviaToken extends @unified_trivia_token, F::AstNode {
     /** Gets the source text of this trivia token. */
     final string getValue() { unified_trivia_tokeninfo(this, _, result) }
 
@@ -98,30 +96,38 @@ module Unified {
   }
 
   /** A class representing `accessor_declaration` nodes. */
-  final class AccessorDeclaration extends @unified_accessor_declaration, AstNodeImpl {
+  class AccessorDeclaration extends @unified_accessor_declaration, F::Member, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AccessorDeclaration" }
 
     /** Gets the node corresponding to the field `accessor_kind`. */
-    final AccessorKind getAccessorKind() { unified_accessor_declaration_def(this, result, _) }
+    final F::AccessorKind getAccessorKind() { unified_accessor_declaration_def(this, result, _) }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_accessor_declaration_body(this, result) }
+    final F::Block getBody() { unified_accessor_declaration_body(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_accessor_declaration_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_accessor_declaration_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_accessor_declaration_def(this, _, result) }
+    final F::Identifier getName() { unified_accessor_declaration_def(this, _, result) }
+
+    /** Gets the node corresponding to the field `parameter`. */
+    final F::Parameter getParameter(int i) {
+      unified_accessor_declaration_parameter(this, i, result)
+    }
 
     /** Gets the node corresponding to the field `parameter`. */
-    final Parameter getParameter(int i) { unified_accessor_declaration_parameter(this, i, result) }
+    final F::Parameter getAParameter() { result = this.getParameter(_) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_accessor_declaration_type(this, result) }
+    final F::TypeExpr getType() { unified_accessor_declaration_type(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_accessor_declaration_def(this, result, _) or
       unified_accessor_declaration_body(this, result) or
       unified_accessor_declaration_modifier(this, _, result) or
@@ -132,27 +138,30 @@ module Unified {
   }
 
   /** A class representing `accessor_kind` tokens. */
-  final class AccessorKind extends @unified_token_accessor_kind, TokenImpl {
+  class AccessorKind extends @unified_token_accessor_kind, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AccessorKind" }
   }
 
   /** A class representing `argument` nodes. */
-  final class Argument extends @unified_argument, AstNodeImpl {
+  class Argument extends @unified_argument, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Argument" }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_argument_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_argument_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_argument_name(this, result) }
+    final F::Identifier getName() { unified_argument_name(this, result) }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_argument_def(this, result) }
+    final F::Expr getValue() { unified_argument_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_argument_modifier(this, _, result) or
       unified_argument_name(this, result) or
       unified_argument_def(this, result)
@@ -160,52 +169,58 @@ module Unified {
   }
 
   /** A class representing `array_literal` nodes. */
-  final class ArrayLiteral extends @unified_array_literal, AstNodeImpl {
+  class ArrayLiteral extends @unified_array_literal, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ArrayLiteral" }
 
     /** Gets the node corresponding to the field `element`. */
-    final Expr getElement(int i) { unified_array_literal_element(this, i, result) }
+    final F::Expr getElement(int i) { unified_array_literal_element(this, i, result) }
+
+    /** Gets the node corresponding to the field `element`. */
+    final F::Expr getAnElement() { result = this.getElement(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_array_literal_element(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { unified_array_literal_element(this, _, result) }
   }
 
   /** A class representing `assign_expr` nodes. */
-  final class AssignExpr extends @unified_assign_expr, AstNodeImpl {
+  class AssignExpr extends @unified_assign_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AssignExpr" }
 
     /** Gets the node corresponding to the field `target`. */
-    final ExprOrPattern getTarget() { unified_assign_expr_def(this, result, _) }
+    final F::ExprOrPattern getTarget() { unified_assign_expr_def(this, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_assign_expr_def(this, _, result) }
+    final F::Expr getValue() { unified_assign_expr_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_assign_expr_def(this, result, _) or unified_assign_expr_def(this, _, result)
     }
   }
 
   /** A class representing `associated_type_declaration` nodes. */
-  final class AssociatedTypeDeclaration extends @unified_associated_type_declaration, AstNodeImpl {
+  class AssociatedTypeDeclaration extends @unified_associated_type_declaration, F::Member {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "AssociatedTypeDeclaration" }
 
     /** Gets the node corresponding to the field `bound`. */
-    final TypeExpr getBound() { unified_associated_type_declaration_bound(this, result) }
+    final F::TypeExpr getBound() { unified_associated_type_declaration_bound(this, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) {
+    final F::Modifier getModifier(int i) {
       unified_associated_type_declaration_modifier(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
+
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_associated_type_declaration_def(this, result) }
+    final F::Identifier getName() { unified_associated_type_declaration_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_associated_type_declaration_bound(this, result) or
       unified_associated_type_declaration_modifier(this, _, result) or
       unified_associated_type_declaration_def(this, result)
@@ -213,38 +228,41 @@ module Unified {
   }
 
   /** A class representing `base_type` nodes. */
-  final class BaseType extends @unified_base_type, AstNodeImpl {
+  class BaseType extends @unified_base_type, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BaseType" }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_base_type_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_base_type_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_base_type_def(this, result) }
+    final F::TypeExpr getType() { unified_base_type_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_base_type_modifier(this, _, result) or unified_base_type_def(this, result)
     }
   }
 
   /** A class representing `binary_expr` nodes. */
-  final class BinaryExpr extends @unified_binary_expr, AstNodeImpl {
+  class BinaryExpr extends @unified_binary_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BinaryExpr" }
 
     /** Gets the node corresponding to the field `left`. */
-    final Expr getLeft() { unified_binary_expr_def(this, result, _, _) }
+    final F::Expr getLeft() { unified_binary_expr_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `operator`. */
-    final InfixOperator getOperator() { unified_binary_expr_def(this, _, result, _) }
+    final F::InfixOperator getOperator() { unified_binary_expr_def(this, _, result, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final Expr getRight() { unified_binary_expr_def(this, _, _, result) }
+    final F::Expr getRight() { unified_binary_expr_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_binary_expr_def(this, result, _, _) or
       unified_binary_expr_def(this, _, result, _) or
       unified_binary_expr_def(this, _, _, result)
@@ -252,89 +270,103 @@ module Unified {
   }
 
   /** A class representing `block` nodes. */
-  final class Block extends @unified_block, AstNodeImpl {
+  class Block extends @unified_block, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Block" }
 
     /** Gets the node corresponding to the field `stmt`. */
-    final Stmt getStmt(int i) { unified_block_stmt(this, i, result) }
+    final F::Stmt getStmt(int i) { unified_block_stmt(this, i, result) }
+
+    /** Gets the node corresponding to the field `stmt`. */
+    final F::Stmt getAStmt() { result = this.getStmt(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_block_stmt(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { unified_block_stmt(this, _, result) }
   }
 
   /** A class representing `boolean_literal` tokens. */
-  final class BooleanLiteral extends @unified_token_boolean_literal, TokenImpl {
+  class BooleanLiteral extends @unified_token_boolean_literal, F::Expr, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BooleanLiteral" }
   }
 
   /** A class representing `bound_type_constraint` nodes. */
-  final class BoundTypeConstraint extends @unified_bound_type_constraint, AstNodeImpl {
+  class BoundTypeConstraint extends @unified_bound_type_constraint, F::TypeConstraint {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BoundTypeConstraint" }
 
     /** Gets the node corresponding to the field `bound`. */
-    final TypeExpr getBound() { unified_bound_type_constraint_def(this, result, _) }
+    final F::TypeExpr getBound() { unified_bound_type_constraint_def(this, result, _) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_bound_type_constraint_def(this, _, result) }
+    final F::TypeExpr getType() { unified_bound_type_constraint_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_bound_type_constraint_def(this, result, _) or
       unified_bound_type_constraint_def(this, _, result)
     }
   }
 
   /** A class representing `break_expr` nodes. */
-  final class BreakExpr extends @unified_break_expr, AstNodeImpl {
+  class BreakExpr extends @unified_break_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BreakExpr" }
 
     /** Gets the node corresponding to the field `label`. */
-    final Identifier getLabel() { unified_break_expr_label(this, result) }
+    final F::Identifier getLabel() { unified_break_expr_label(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_break_expr_label(this, result) }
+    final override F::AstNode getAFieldOrChild() { unified_break_expr_label(this, result) }
   }
 
   /** A class representing `builtin_expr` tokens. */
-  final class BuiltinExpr extends @unified_token_builtin_expr, TokenImpl {
+  class BuiltinExpr extends @unified_token_builtin_expr, F::Expr, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BuiltinExpr" }
   }
 
   /** A class representing `bulk_importing_pattern` nodes. */
-  final class BulkImportingPattern extends @unified_bulk_importing_pattern, AstNodeImpl {
+  class BulkImportingPattern extends @unified_bulk_importing_pattern, F::Pattern {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "BulkImportingPattern" }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_bulk_importing_pattern_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) {
+      unified_bulk_importing_pattern_modifier(this, i, result)
+    }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_bulk_importing_pattern_modifier(this, _, result)
     }
   }
 
   /** A class representing `call_expr` nodes. */
-  final class CallExpr extends @unified_call_expr, AstNodeImpl {
+  class CallExpr extends @unified_call_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CallExpr" }
 
     /** Gets the node corresponding to the field `argument`. */
-    final Argument getArgument(int i) { unified_call_expr_argument(this, i, result) }
+    final F::Argument getArgument(int i) { unified_call_expr_argument(this, i, result) }
+
+    /** Gets the node corresponding to the field `argument`. */
+    final F::Argument getAnArgument() { result = this.getArgument(_) }
 
     /** Gets the node corresponding to the field `callee`. */
-    final ExprOrType getCallee() { unified_call_expr_def(this, result) }
+    final F::ExprOrType getCallee() { unified_call_expr_def(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_call_expr_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_call_expr_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_call_expr_argument(this, _, result) or
       unified_call_expr_def(this, result) or
       unified_call_expr_modifier(this, _, result)
@@ -342,21 +374,24 @@ module Unified {
   }
 
   /** A class representing `catch_clause` nodes. */
-  final class CatchClause extends @unified_catch_clause, AstNodeImpl {
+  class CatchClause extends @unified_catch_clause, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CatchClause" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_catch_clause_def(this, result) }
+    final F::Block getBody() { unified_catch_clause_def(this, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_catch_clause_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_catch_clause_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_catch_clause_pattern(this, result) }
+    final F::Pattern getPattern() { unified_catch_clause_pattern(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_catch_clause_def(this, result) or
       unified_catch_clause_modifier(this, _, result) or
       unified_catch_clause_pattern(this, result)
@@ -364,34 +399,53 @@ module Unified {
   }
 
   /** A class representing `class_like_declaration` nodes. */
-  final class ClassLikeDeclaration extends @unified_class_like_declaration, AstNodeImpl {
+  class ClassLikeDeclaration extends @unified_class_like_declaration, F::Member, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ClassLikeDeclaration" }
 
     /** Gets the node corresponding to the field `base_type`. */
-    final BaseType getBaseType(int i) { unified_class_like_declaration_base_type(this, i, result) }
+    final F::BaseType getBaseType(int i) {
+      unified_class_like_declaration_base_type(this, i, result)
+    }
+
+    /** Gets the node corresponding to the field `base_type`. */
+    final F::BaseType getABaseType() { result = this.getBaseType(_) }
+
+    /** Gets the node corresponding to the field `member`. */
+    final F::Member getMember(int i) { unified_class_like_declaration_member(this, i, result) }
 
     /** Gets the node corresponding to the field `member`. */
-    final Member getMember(int i) { unified_class_like_declaration_member(this, i, result) }
+    final F::Member getAMember() { result = this.getMember(_) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_class_like_declaration_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) {
+      unified_class_like_declaration_modifier(this, i, result)
+    }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_class_like_declaration_name(this, result) }
+    final F::Identifier getName() { unified_class_like_declaration_name(this, result) }
 
     /** Gets the node corresponding to the field `type_constraint`. */
-    final TypeConstraint getTypeConstraint(int i) {
+    final F::TypeConstraint getTypeConstraint(int i) {
       unified_class_like_declaration_type_constraint(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `type_constraint`. */
+    final F::TypeConstraint getATypeConstraint() { result = this.getTypeConstraint(_) }
+
     /** Gets the node corresponding to the field `type_parameter`. */
-    final TypeParameter getTypeParameter(int i) {
+    final F::TypeParameter getTypeParameter(int i) {
       unified_class_like_declaration_type_parameter(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `type_parameter`. */
+    final F::TypeParameter getATypeParameter() { result = this.getTypeParameter(_) }
+
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_class_like_declaration_base_type(this, _, result) or
       unified_class_like_declaration_member(this, _, result) or
       unified_class_like_declaration_modifier(this, _, result) or
@@ -402,21 +456,21 @@ module Unified {
   }
 
   /** A class representing `compound_assign_expr` nodes. */
-  final class CompoundAssignExpr extends @unified_compound_assign_expr, AstNodeImpl {
+  class CompoundAssignExpr extends @unified_compound_assign_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "CompoundAssignExpr" }
 
     /** Gets the node corresponding to the field `operator`. */
-    final InfixOperator getOperator() { unified_compound_assign_expr_def(this, result, _, _) }
+    final F::InfixOperator getOperator() { unified_compound_assign_expr_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `target`. */
-    final Expr getTarget() { unified_compound_assign_expr_def(this, _, result, _) }
+    final F::Expr getTarget() { unified_compound_assign_expr_def(this, _, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_compound_assign_expr_def(this, _, _, result) }
+    final F::Expr getValue() { unified_compound_assign_expr_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_compound_assign_expr_def(this, result, _, _) or
       unified_compound_assign_expr_def(this, _, result, _) or
       unified_compound_assign_expr_def(this, _, _, result)
@@ -424,21 +478,24 @@ module Unified {
   }
 
   /** A class representing `conditional_pattern` nodes. */
-  final class ConditionalPattern extends @unified_conditional_pattern, AstNodeImpl {
+  class ConditionalPattern extends @unified_conditional_pattern, F::Pattern {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ConditionalPattern" }
 
     /** Gets the node corresponding to the field `condition`. */
-    final Expr getCondition() { unified_conditional_pattern_def(this, result, _) }
+    final F::Expr getCondition() { unified_conditional_pattern_def(this, result, _) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_conditional_pattern_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_conditional_pattern_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_conditional_pattern_def(this, _, result) }
+    final F::Pattern getPattern() { unified_conditional_pattern_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_conditional_pattern_def(this, result, _) or
       unified_conditional_pattern_modifier(this, _, result) or
       unified_conditional_pattern_def(this, _, result)
@@ -446,26 +503,34 @@ module Unified {
   }
 
   /** A class representing `constructor_declaration` nodes. */
-  final class ConstructorDeclaration extends @unified_constructor_declaration, AstNodeImpl {
+  class ConstructorDeclaration extends @unified_constructor_declaration, F::Member, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ConstructorDeclaration" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_constructor_declaration_def(this, result) }
+    final F::Block getBody() { unified_constructor_declaration_def(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) {
+      unified_constructor_declaration_modifier(this, i, result)
+    }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_constructor_declaration_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_constructor_declaration_name(this, result) }
+    final F::Identifier getName() { unified_constructor_declaration_name(this, result) }
 
     /** Gets the node corresponding to the field `parameter`. */
-    final Parameter getParameter(int i) {
+    final F::Parameter getParameter(int i) {
       unified_constructor_declaration_parameter(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `parameter`. */
+    final F::Parameter getAParameter() { result = this.getParameter(_) }
+
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_constructor_declaration_def(this, result) or
       unified_constructor_declaration_modifier(this, _, result) or
       unified_constructor_declaration_name(this, result) or
@@ -474,21 +539,29 @@ module Unified {
   }
 
   /** A class representing `constructor_pattern` nodes. */
-  final class ConstructorPattern extends @unified_constructor_pattern, AstNodeImpl {
+  class ConstructorPattern extends @unified_constructor_pattern, F::Pattern {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ConstructorPattern" }
 
     /** Gets the node corresponding to the field `constructor`. */
-    final ExprOrType getConstructor() { unified_constructor_pattern_def(this, result) }
+    final F::ExprOrType getConstructor() { unified_constructor_pattern_def(this, result) }
 
     /** Gets the node corresponding to the field `element`. */
-    final PatternElement getElement(int i) { unified_constructor_pattern_element(this, i, result) }
+    final F::PatternElement getElement(int i) {
+      unified_constructor_pattern_element(this, i, result)
+    }
+
+    /** Gets the node corresponding to the field `element`. */
+    final F::PatternElement getAnElement() { result = this.getElement(_) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_constructor_pattern_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_constructor_pattern_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_constructor_pattern_def(this, result) or
       unified_constructor_pattern_element(this, _, result) or
       unified_constructor_pattern_modifier(this, _, result)
@@ -496,51 +569,59 @@ module Unified {
   }
 
   /** A class representing `continue_expr` nodes. */
-  final class ContinueExpr extends @unified_continue_expr, AstNodeImpl {
+  class ContinueExpr extends @unified_continue_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ContinueExpr" }
 
     /** Gets the node corresponding to the field `label`. */
-    final Identifier getLabel() { unified_continue_expr_label(this, result) }
+    final F::Identifier getLabel() { unified_continue_expr_label(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_continue_expr_label(this, result) }
+    final override F::AstNode getAFieldOrChild() { unified_continue_expr_label(this, result) }
   }
 
   /** A class representing `destructor_declaration` nodes. */
-  final class DestructorDeclaration extends @unified_destructor_declaration, AstNodeImpl {
+  class DestructorDeclaration extends @unified_destructor_declaration, F::Member, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "DestructorDeclaration" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_destructor_declaration_def(this, result) }
+    final F::Block getBody() { unified_destructor_declaration_def(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) {
+      unified_destructor_declaration_modifier(this, i, result)
+    }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_destructor_declaration_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_destructor_declaration_def(this, result) or
       unified_destructor_declaration_modifier(this, _, result)
     }
   }
 
   /** A class representing `do_while_stmt` nodes. */
-  final class DoWhileStmt extends @unified_do_while_stmt, AstNodeImpl {
+  class DoWhileStmt extends @unified_do_while_stmt, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "DoWhileStmt" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_do_while_stmt_body(this, result) }
+    final F::Block getBody() { unified_do_while_stmt_body(this, result) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final Expr getCondition() { unified_do_while_stmt_def(this, result) }
+    final F::Expr getCondition() { unified_do_while_stmt_def(this, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_do_while_stmt_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_do_while_stmt_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_do_while_stmt_body(this, result) or
       unified_do_while_stmt_def(this, result) or
       unified_do_while_stmt_modifier(this, _, result)
@@ -548,83 +629,86 @@ module Unified {
   }
 
   /** A class representing `empty_expr` tokens. */
-  final class EmptyExpr extends @unified_token_empty_expr, TokenImpl {
+  class EmptyExpr extends @unified_token_empty_expr, F::Expr, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "EmptyExpr" }
   }
 
   /** A class representing `equality_type_constraint` nodes. */
-  final class EqualityTypeConstraint extends @unified_equality_type_constraint, AstNodeImpl {
+  class EqualityTypeConstraint extends @unified_equality_type_constraint, F::TypeConstraint {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "EqualityTypeConstraint" }
 
     /** Gets the node corresponding to the field `left`. */
-    final TypeExpr getLeft() { unified_equality_type_constraint_def(this, result, _) }
+    final F::TypeExpr getLeft() { unified_equality_type_constraint_def(this, result, _) }
 
     /** Gets the node corresponding to the field `right`. */
-    final TypeExpr getRight() { unified_equality_type_constraint_def(this, _, result) }
+    final F::TypeExpr getRight() { unified_equality_type_constraint_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_equality_type_constraint_def(this, result, _) or
       unified_equality_type_constraint_def(this, _, result)
     }
   }
 
-  final class Expr extends @unified_expr, AstNodeImpl { }
+  class Expr extends @unified_expr, F::ExprOrOperator, F::ExprOrPattern, F::ExprOrType, F::Stmt { }
 
   /** A class representing `expr_equality_pattern` nodes. */
-  final class ExprEqualityPattern extends @unified_expr_equality_pattern, AstNodeImpl {
+  class ExprEqualityPattern extends @unified_expr_equality_pattern, F::Pattern {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ExprEqualityPattern" }
 
     /** Gets the node corresponding to the field `expr`. */
-    final Expr getExpr() { unified_expr_equality_pattern_def(this, result) }
+    final F::Expr getExpr() { unified_expr_equality_pattern_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_expr_equality_pattern_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { unified_expr_equality_pattern_def(this, result) }
   }
 
-  final class ExprOrOperator extends @unified_expr_or_operator, AstNodeImpl { }
+  class ExprOrOperator extends @unified_expr_or_operator, F::AstNode { }
 
-  final class ExprOrPattern extends @unified_expr_or_pattern, AstNodeImpl { }
+  class ExprOrPattern extends @unified_expr_or_pattern, F::AstNode { }
 
-  final class ExprOrType extends @unified_expr_or_type, AstNodeImpl { }
+  class ExprOrType extends @unified_expr_or_type, F::AstNode { }
 
   /** A class representing `fixity` tokens. */
-  final class Fixity extends @unified_token_fixity, TokenImpl {
+  class Fixity extends @unified_token_fixity, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Fixity" }
   }
 
   /** A class representing `float_literal` tokens. */
-  final class FloatLiteral extends @unified_token_float_literal, TokenImpl {
+  class FloatLiteral extends @unified_token_float_literal, F::Expr, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "FloatLiteral" }
   }
 
   /** A class representing `for_each_stmt` nodes. */
-  final class ForEachStmt extends @unified_for_each_stmt, AstNodeImpl {
+  class ForEachStmt extends @unified_for_each_stmt, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ForEachStmt" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_for_each_stmt_body(this, result) }
+    final F::Block getBody() { unified_for_each_stmt_body(this, result) }
 
     /** Gets the node corresponding to the field `guard`. */
-    final Expr getGuard() { unified_for_each_stmt_guard(this, result) }
+    final F::Expr getGuard() { unified_for_each_stmt_guard(this, result) }
 
     /** Gets the node corresponding to the field `iterable`. */
-    final Expr getIterable() { unified_for_each_stmt_def(this, result, _) }
+    final F::Expr getIterable() { unified_for_each_stmt_def(this, result, _) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_for_each_stmt_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_for_each_stmt_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_for_each_stmt_def(this, _, result) }
+    final F::Pattern getPattern() { unified_for_each_stmt_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_for_each_stmt_body(this, result) or
       unified_for_each_stmt_guard(this, result) or
       unified_for_each_stmt_def(this, result, _) or
@@ -634,37 +718,51 @@ module Unified {
   }
 
   /** A class representing `function_declaration` nodes. */
-  final class FunctionDeclaration extends @unified_function_declaration, AstNodeImpl {
+  class FunctionDeclaration extends @unified_function_declaration, F::Member, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "FunctionDeclaration" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_function_declaration_body(this, result) }
+    final F::Block getBody() { unified_function_declaration_body(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_function_declaration_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_function_declaration_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_function_declaration_def(this, result) }
+    final F::Identifier getName() { unified_function_declaration_def(this, result) }
 
     /** Gets the node corresponding to the field `parameter`. */
-    final Parameter getParameter(int i) { unified_function_declaration_parameter(this, i, result) }
+    final F::Parameter getParameter(int i) {
+      unified_function_declaration_parameter(this, i, result)
+    }
+
+    /** Gets the node corresponding to the field `parameter`. */
+    final F::Parameter getAParameter() { result = this.getParameter(_) }
 
     /** Gets the node corresponding to the field `return_type`. */
-    final TypeExpr getReturnType() { unified_function_declaration_return_type(this, result) }
+    final F::TypeExpr getReturnType() { unified_function_declaration_return_type(this, result) }
 
     /** Gets the node corresponding to the field `type_constraint`. */
-    final TypeConstraint getTypeConstraint(int i) {
+    final F::TypeConstraint getTypeConstraint(int i) {
       unified_function_declaration_type_constraint(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `type_constraint`. */
+    final F::TypeConstraint getATypeConstraint() { result = this.getTypeConstraint(_) }
+
     /** Gets the node corresponding to the field `type_parameter`. */
-    final TypeParameter getTypeParameter(int i) {
+    final F::TypeParameter getTypeParameter(int i) {
       unified_function_declaration_type_parameter(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `type_parameter`. */
+    final F::TypeParameter getATypeParameter() { result = this.getTypeParameter(_) }
+
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_function_declaration_body(this, result) or
       unified_function_declaration_modifier(this, _, result) or
       unified_function_declaration_def(this, result) or
@@ -676,29 +774,38 @@ module Unified {
   }
 
   /** A class representing `function_expr` nodes. */
-  final class FunctionExpr extends @unified_function_expr, AstNodeImpl {
+  class FunctionExpr extends @unified_function_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "FunctionExpr" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_function_expr_def(this, result) }
+    final F::Block getBody() { unified_function_expr_def(this, result) }
 
     /** Gets the node corresponding to the field `capture_declaration`. */
-    final VariableDeclaration getCaptureDeclaration(int i) {
+    final F::VariableDeclaration getCaptureDeclaration(int i) {
       unified_function_expr_capture_declaration(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `capture_declaration`. */
+    final F::VariableDeclaration getACaptureDeclaration() { result = this.getCaptureDeclaration(_) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_function_expr_modifier(this, i, result) }
+
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_function_expr_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `parameter`. */
-    final Parameter getParameter(int i) { unified_function_expr_parameter(this, i, result) }
+    final F::Parameter getParameter(int i) { unified_function_expr_parameter(this, i, result) }
+
+    /** Gets the node corresponding to the field `parameter`. */
+    final F::Parameter getAParameter() { result = this.getParameter(_) }
 
     /** Gets the node corresponding to the field `return_type`. */
-    final TypeExpr getReturnType() { unified_function_expr_return_type(this, result) }
+    final F::TypeExpr getReturnType() { unified_function_expr_return_type(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_function_expr_def(this, result) or
       unified_function_expr_capture_declaration(this, _, result) or
       unified_function_expr_modifier(this, _, result) or
@@ -708,82 +815,88 @@ module Unified {
   }
 
   /** A class representing `function_type_expr` nodes. */
-  final class FunctionTypeExpr extends @unified_function_type_expr, AstNodeImpl {
+  class FunctionTypeExpr extends @unified_function_type_expr, F::TypeExpr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "FunctionTypeExpr" }
 
     /** Gets the node corresponding to the field `parameter`. */
-    final Parameter getParameter(int i) { unified_function_type_expr_parameter(this, i, result) }
+    final F::Parameter getParameter(int i) { unified_function_type_expr_parameter(this, i, result) }
+
+    /** Gets the node corresponding to the field `parameter`. */
+    final F::Parameter getAParameter() { result = this.getParameter(_) }
 
     /** Gets the node corresponding to the field `return_type`. */
-    final TypeExpr getReturnType() { unified_function_type_expr_def(this, result) }
+    final F::TypeExpr getReturnType() { unified_function_type_expr_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_function_type_expr_parameter(this, _, result) or
       unified_function_type_expr_def(this, result)
     }
   }
 
   /** A class representing `generic_type_expr` nodes. */
-  final class GenericTypeExpr extends @unified_generic_type_expr, AstNodeImpl {
+  class GenericTypeExpr extends @unified_generic_type_expr, F::TypeExpr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "GenericTypeExpr" }
 
     /** Gets the node corresponding to the field `base`. */
-    final TypeExpr getBase() { unified_generic_type_expr_def(this, result) }
+    final F::TypeExpr getBase() { unified_generic_type_expr_def(this, result) }
 
     /** Gets the node corresponding to the field `type_argument`. */
-    final TypeExpr getTypeArgument(int i) {
+    final F::TypeExpr getTypeArgument(int i) {
       unified_generic_type_expr_type_argument(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `type_argument`. */
+    final F::TypeExpr getATypeArgument() { result = this.getTypeArgument(_) }
+
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_generic_type_expr_def(this, result) or
       unified_generic_type_expr_type_argument(this, _, result)
     }
   }
 
   /** A class representing `guard_if_stmt` nodes. */
-  final class GuardIfStmt extends @unified_guard_if_stmt, AstNodeImpl {
+  class GuardIfStmt extends @unified_guard_if_stmt, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "GuardIfStmt" }
 
     /** Gets the node corresponding to the field `condition`. */
-    final Expr getCondition() { unified_guard_if_stmt_def(this, result, _) }
+    final F::Expr getCondition() { unified_guard_if_stmt_def(this, result, _) }
 
     /** Gets the node corresponding to the field `else`. */
-    final Block getElse() { unified_guard_if_stmt_def(this, _, result) }
+    final F::Block getElse() { unified_guard_if_stmt_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_guard_if_stmt_def(this, result, _) or unified_guard_if_stmt_def(this, _, result)
     }
   }
 
   /** A class representing `identifier` tokens. */
-  final class Identifier extends @unified_token_identifier, TokenImpl {
+  class Identifier extends @unified_token_identifier, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Identifier" }
   }
 
   /** A class representing `if_expr` nodes. */
-  final class IfExpr extends @unified_if_expr, AstNodeImpl {
+  class IfExpr extends @unified_if_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "IfExpr" }
 
     /** Gets the node corresponding to the field `condition`. */
-    final Expr getCondition() { unified_if_expr_def(this, result) }
+    final F::Expr getCondition() { unified_if_expr_def(this, result) }
 
     /** Gets the node corresponding to the field `else`. */
-    final Expr getElse() { unified_if_expr_else(this, result) }
+    final F::Expr getElse() { unified_if_expr_else(this, result) }
 
     /** Gets the node corresponding to the field `then`. */
-    final Expr getThen() { unified_if_expr_then(this, result) }
+    final F::Expr getThen() { unified_if_expr_then(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_if_expr_def(this, result) or
       unified_if_expr_else(this, result) or
       unified_if_expr_then(this, result)
@@ -791,27 +904,30 @@ module Unified {
   }
 
   /** A class representing `ignore_pattern` tokens. */
-  final class IgnorePattern extends @unified_token_ignore_pattern, TokenImpl {
+  class IgnorePattern extends @unified_token_ignore_pattern, F::Pattern, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "IgnorePattern" }
   }
 
   /** A class representing `import_declaration` nodes. */
-  final class ImportDeclaration extends @unified_import_declaration, AstNodeImpl {
+  class ImportDeclaration extends @unified_import_declaration, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ImportDeclaration" }
 
     /** Gets the node corresponding to the field `imported_expr`. */
-    final Expr getImportedExpr() { unified_import_declaration_def(this, result) }
+    final F::Expr getImportedExpr() { unified_import_declaration_def(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_import_declaration_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_import_declaration_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_import_declaration_pattern(this, result) }
+    final F::Pattern getPattern() { unified_import_declaration_pattern(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_import_declaration_def(this, result) or
       unified_import_declaration_modifier(this, _, result) or
       unified_import_declaration_pattern(this, result)
@@ -819,182 +935,198 @@ module Unified {
   }
 
   /** A class representing `inferred_type_expr` tokens. */
-  final class InferredTypeExpr extends @unified_token_inferred_type_expr, TokenImpl {
+  class InferredTypeExpr extends @unified_token_inferred_type_expr, F::Token, F::TypeExpr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "InferredTypeExpr" }
   }
 
   /** A class representing `infix_operator` tokens. */
-  final class InfixOperator extends @unified_token_infix_operator, TokenImpl {
+  class InfixOperator extends @unified_token_infix_operator, F::ExprOrOperator, F::Operator,
+    F::Token
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "InfixOperator" }
   }
 
   /** A class representing `initializer_declaration` nodes. */
-  final class InitializerDeclaration extends @unified_initializer_declaration, AstNodeImpl {
+  class InitializerDeclaration extends @unified_initializer_declaration, F::Member {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "InitializerDeclaration" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_initializer_declaration_def(this, result) }
+    final F::Block getBody() { unified_initializer_declaration_def(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) {
+      unified_initializer_declaration_modifier(this, i, result)
+    }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_initializer_declaration_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_initializer_declaration_def(this, result) or
       unified_initializer_declaration_modifier(this, _, result)
     }
   }
 
   /** A class representing `int_literal` tokens. */
-  final class IntLiteral extends @unified_token_int_literal, TokenImpl {
+  class IntLiteral extends @unified_token_int_literal, F::Expr, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "IntLiteral" }
   }
 
   /** A class representing `key_value_pair` nodes. */
-  final class KeyValuePair extends @unified_key_value_pair, AstNodeImpl {
+  class KeyValuePair extends @unified_key_value_pair, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "KeyValuePair" }
 
     /** Gets the node corresponding to the field `key`. */
-    final Expr getKey() { unified_key_value_pair_def(this, result, _) }
+    final F::Expr getKey() { unified_key_value_pair_def(this, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_key_value_pair_def(this, _, result) }
+    final F::Expr getValue() { unified_key_value_pair_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_key_value_pair_def(this, result, _) or unified_key_value_pair_def(this, _, result)
     }
   }
 
   /** A class representing `labeled_stmt` nodes. */
-  final class LabeledStmt extends @unified_labeled_stmt, AstNodeImpl {
+  class LabeledStmt extends @unified_labeled_stmt, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "LabeledStmt" }
 
     /** Gets the node corresponding to the field `label`. */
-    final Identifier getLabel() { unified_labeled_stmt_def(this, result, _) }
+    final F::Identifier getLabel() { unified_labeled_stmt_def(this, result, _) }
 
     /** Gets the node corresponding to the field `stmt`. */
-    final Stmt getStmt() { unified_labeled_stmt_def(this, _, result) }
+    final F::Stmt getStmt() { unified_labeled_stmt_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_labeled_stmt_def(this, result, _) or unified_labeled_stmt_def(this, _, result)
     }
   }
 
   /** A class representing `map_literal` nodes. */
-  final class MapLiteral extends @unified_map_literal, AstNodeImpl {
+  class MapLiteral extends @unified_map_literal, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "MapLiteral" }
 
     /** Gets the node corresponding to the field `element`. */
-    final Expr getElement(int i) { unified_map_literal_element(this, i, result) }
+    final F::Expr getElement(int i) { unified_map_literal_element(this, i, result) }
+
+    /** Gets the node corresponding to the field `element`. */
+    final F::Expr getAnElement() { result = this.getElement(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_map_literal_element(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { unified_map_literal_element(this, _, result) }
   }
 
-  final class Member extends @unified_member, AstNodeImpl { }
+  class Member extends @unified_member, F::AstNode { }
 
   /** A class representing `member_access_expr` nodes. */
-  final class MemberAccessExpr extends @unified_member_access_expr, AstNodeImpl {
+  class MemberAccessExpr extends @unified_member_access_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "MemberAccessExpr" }
 
     /** Gets the node corresponding to the field `base`. */
-    final ExprOrType getBase() { unified_member_access_expr_def(this, result, _) }
+    final F::ExprOrType getBase() { unified_member_access_expr_def(this, result, _) }
 
     /** Gets the node corresponding to the field `member`. */
-    final Identifier getMember() { unified_member_access_expr_def(this, _, result) }
+    final F::Identifier getMember() { unified_member_access_expr_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_member_access_expr_def(this, result, _) or
       unified_member_access_expr_def(this, _, result)
     }
   }
 
   /** A class representing `modifier` tokens. */
-  final class Modifier extends @unified_token_modifier, TokenImpl {
+  class Modifier extends @unified_token_modifier, F::AstNode, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Modifier" }
   }
 
   /** A class representing `name_expr` nodes. */
-  final class NameExpr extends @unified_name_expr, AstNodeImpl {
+  class NameExpr extends @unified_name_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "NameExpr" }
 
     /** Gets the node corresponding to the field `identifier`. */
-    final Identifier getIdentifier() { unified_name_expr_def(this, result) }
+    final F::Identifier getIdentifier() { unified_name_expr_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_name_expr_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { unified_name_expr_def(this, result) }
   }
 
   /** A class representing `name_pattern` nodes. */
-  final class NamePattern extends @unified_name_pattern, AstNodeImpl {
+  class NamePattern extends @unified_name_pattern, F::Pattern {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "NamePattern" }
 
     /** Gets the node corresponding to the field `identifier`. */
-    final Identifier getIdentifier() { unified_name_pattern_def(this, result) }
+    final F::Identifier getIdentifier() { unified_name_pattern_def(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_name_pattern_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_name_pattern_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_name_pattern_def(this, result) or unified_name_pattern_modifier(this, _, result)
     }
   }
 
   /** A class representing `named_type_expr` nodes. */
-  final class NamedTypeExpr extends @unified_named_type_expr, AstNodeImpl {
+  class NamedTypeExpr extends @unified_named_type_expr, F::TypeExpr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "NamedTypeExpr" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_named_type_expr_def(this, result) }
+    final F::Identifier getName() { unified_named_type_expr_def(this, result) }
 
     /** Gets the node corresponding to the field `qualifier`. */
-    final TypeExpr getQualifier() { unified_named_type_expr_qualifier(this, result) }
+    final F::TypeExpr getQualifier() { unified_named_type_expr_qualifier(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_named_type_expr_def(this, result) or unified_named_type_expr_qualifier(this, result)
     }
   }
 
-  final class Operator extends @unified_operator, AstNodeImpl { }
+  class Operator extends @unified_operator, F::AstNode { }
 
   /** A class representing `operator_syntax_declaration` nodes. */
-  final class OperatorSyntaxDeclaration extends @unified_operator_syntax_declaration, AstNodeImpl {
+  class OperatorSyntaxDeclaration extends @unified_operator_syntax_declaration, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "OperatorSyntaxDeclaration" }
 
     /** Gets the node corresponding to the field `fixity`. */
-    final Fixity getFixity() { unified_operator_syntax_declaration_fixity(this, result) }
+    final F::Fixity getFixity() { unified_operator_syntax_declaration_fixity(this, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) {
+    final F::Modifier getModifier(int i) {
       unified_operator_syntax_declaration_modifier(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
+
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_operator_syntax_declaration_def(this, result) }
+    final F::Identifier getName() { unified_operator_syntax_declaration_def(this, result) }
 
     /** Gets the node corresponding to the field `precedence`. */
-    final Expr getPrecedence() { unified_operator_syntax_declaration_precedence(this, result) }
+    final F::Expr getPrecedence() { unified_operator_syntax_declaration_precedence(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_operator_syntax_declaration_fixity(this, result) or
       unified_operator_syntax_declaration_modifier(this, _, result) or
       unified_operator_syntax_declaration_def(this, result) or
@@ -1003,44 +1135,53 @@ module Unified {
   }
 
   /** A class representing `or_pattern` nodes. */
-  final class OrPattern extends @unified_or_pattern, AstNodeImpl {
+  class OrPattern extends @unified_or_pattern, F::Pattern {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "OrPattern" }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_or_pattern_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_or_pattern_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
+
+    /** Gets the node corresponding to the field `pattern`. */
+    final F::Pattern getPattern(int i) { unified_or_pattern_pattern(this, i, result) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern(int i) { unified_or_pattern_pattern(this, i, result) }
+    final F::Pattern getAPattern() { result = this.getPattern(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_or_pattern_modifier(this, _, result) or unified_or_pattern_pattern(this, _, result)
     }
   }
 
   /** A class representing `parameter` nodes. */
-  final class Parameter extends @unified_parameter, AstNodeImpl {
+  class Parameter extends @unified_parameter, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "Parameter" }
 
     /** Gets the node corresponding to the field `default`. */
-    final Expr getDefault() { unified_parameter_default(this, result) }
+    final F::Expr getDefault() { unified_parameter_default(this, result) }
 
     /** Gets the node corresponding to the field `external_name`. */
-    final Identifier getExternalName() { unified_parameter_external_name(this, result) }
+    final F::Identifier getExternalName() { unified_parameter_external_name(this, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_parameter_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_parameter_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_parameter_pattern(this, result) }
+    final F::Pattern getPattern() { unified_parameter_pattern(this, result) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_parameter_type(this, result) }
+    final F::TypeExpr getType() { unified_parameter_type(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_parameter_default(this, result) or
       unified_parameter_external_name(this, result) or
       unified_parameter_modifier(this, _, result) or
@@ -1049,24 +1190,27 @@ module Unified {
     }
   }
 
-  final class Pattern extends @unified_pattern, AstNodeImpl { }
+  class Pattern extends @unified_pattern, F::ExprOrPattern { }
 
   /** A class representing `pattern_element` nodes. */
-  final class PatternElement extends @unified_pattern_element, AstNodeImpl {
+  class PatternElement extends @unified_pattern_element, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PatternElement" }
 
     /** Gets the node corresponding to the field `key`. */
-    final Identifier getKey() { unified_pattern_element_key(this, result) }
+    final F::Identifier getKey() { unified_pattern_element_key(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_pattern_element_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_pattern_element_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_pattern_element_def(this, result) }
+    final F::Pattern getPattern() { unified_pattern_element_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_pattern_element_key(this, result) or
       unified_pattern_element_modifier(this, _, result) or
       unified_pattern_element_def(this, result)
@@ -1074,83 +1218,86 @@ module Unified {
   }
 
   /** A class representing `pattern_guard_expr` nodes. */
-  final class PatternGuardExpr extends @unified_pattern_guard_expr, AstNodeImpl {
+  class PatternGuardExpr extends @unified_pattern_guard_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PatternGuardExpr" }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_pattern_guard_expr_def(this, result, _) }
+    final F::Pattern getPattern() { unified_pattern_guard_expr_def(this, result, _) }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_pattern_guard_expr_def(this, _, result) }
+    final F::Expr getValue() { unified_pattern_guard_expr_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_pattern_guard_expr_def(this, result, _) or
       unified_pattern_guard_expr_def(this, _, result)
     }
   }
 
   /** A class representing `postfix_operator` tokens. */
-  final class PostfixOperator extends @unified_token_postfix_operator, TokenImpl {
+  class PostfixOperator extends @unified_token_postfix_operator, F::Operator, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PostfixOperator" }
   }
 
   /** A class representing `prefix_operator` tokens. */
-  final class PrefixOperator extends @unified_token_prefix_operator, TokenImpl {
+  class PrefixOperator extends @unified_token_prefix_operator, F::Operator, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "PrefixOperator" }
   }
 
   /** A class representing `regex_literal` tokens. */
-  final class RegexLiteral extends @unified_token_regex_literal, TokenImpl {
+  class RegexLiteral extends @unified_token_regex_literal, F::Expr, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "RegexLiteral" }
   }
 
   /** A class representing `return_expr` nodes. */
-  final class ReturnExpr extends @unified_return_expr, AstNodeImpl {
+  class ReturnExpr extends @unified_return_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ReturnExpr" }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_return_expr_value(this, result) }
+    final F::Expr getValue() { unified_return_expr_value(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_return_expr_value(this, result) }
+    final override F::AstNode getAFieldOrChild() { unified_return_expr_value(this, result) }
   }
 
-  final class Stmt extends @unified_stmt, AstNodeImpl { }
+  class Stmt extends @unified_stmt, F::AstNode { }
 
   /** A class representing `string_literal` tokens. */
-  final class StringLiteral extends @unified_token_string_literal, TokenImpl {
+  class StringLiteral extends @unified_token_string_literal, F::Expr, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "StringLiteral" }
   }
 
   /** A class representing `super_expr` tokens. */
-  final class SuperExpr extends @unified_token_super_expr, TokenImpl {
+  class SuperExpr extends @unified_token_super_expr, F::Expr, F::Token {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SuperExpr" }
   }
 
   /** A class representing `switch_case` nodes. */
-  final class SwitchCase extends @unified_switch_case, AstNodeImpl {
+  class SwitchCase extends @unified_switch_case, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SwitchCase" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_switch_case_def(this, result) }
+    final F::Block getBody() { unified_switch_case_def(this, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_switch_case_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_switch_case_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_switch_case_pattern(this, result) }
+    final F::Pattern getPattern() { unified_switch_case_pattern(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_switch_case_def(this, result) or
       unified_switch_case_modifier(this, _, result) or
       unified_switch_case_pattern(this, result)
@@ -1158,21 +1305,27 @@ module Unified {
   }
 
   /** A class representing `switch_expr` nodes. */
-  final class SwitchExpr extends @unified_switch_expr, AstNodeImpl {
+  class SwitchExpr extends @unified_switch_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "SwitchExpr" }
 
     /** Gets the node corresponding to the field `case`. */
-    final SwitchCase getCase(int i) { unified_switch_expr_case(this, i, result) }
+    final F::SwitchCase getCase(int i) { unified_switch_expr_case(this, i, result) }
+
+    /** Gets the node corresponding to the field `case`. */
+    final F::SwitchCase getACase() { result = this.getCase(_) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_switch_expr_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_switch_expr_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_switch_expr_def(this, result) }
+    final F::Expr getValue() { unified_switch_expr_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_switch_expr_case(this, _, result) or
       unified_switch_expr_modifier(this, _, result) or
       unified_switch_expr_def(this, result)
@@ -1180,45 +1333,51 @@ module Unified {
   }
 
   /** A class representing `throw_expr` nodes. */
-  final class ThrowExpr extends @unified_throw_expr, AstNodeImpl {
+  class ThrowExpr extends @unified_throw_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "ThrowExpr" }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_throw_expr_value(this, result) }
+    final F::Expr getValue() { unified_throw_expr_value(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_throw_expr_value(this, result) }
+    final override F::AstNode getAFieldOrChild() { unified_throw_expr_value(this, result) }
   }
 
   /** A class representing `top_level` nodes. */
-  final class TopLevel extends @unified_top_level, AstNodeImpl {
+  class TopLevel extends @unified_top_level, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TopLevel" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_top_level_def(this, result) }
+    final F::Block getBody() { unified_top_level_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_top_level_def(this, result) }
+    final override F::AstNode getAFieldOrChild() { unified_top_level_def(this, result) }
   }
 
   /** A class representing `try_expr` nodes. */
-  final class TryExpr extends @unified_try_expr, AstNodeImpl {
+  class TryExpr extends @unified_try_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TryExpr" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_try_expr_def(this, result) }
+    final F::Block getBody() { unified_try_expr_def(this, result) }
 
     /** Gets the node corresponding to the field `catch_clause`. */
-    final CatchClause getCatchClause(int i) { unified_try_expr_catch_clause(this, i, result) }
+    final F::CatchClause getCatchClause(int i) { unified_try_expr_catch_clause(this, i, result) }
+
+    /** Gets the node corresponding to the field `catch_clause`. */
+    final F::CatchClause getACatchClause() { result = this.getCatchClause(_) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_try_expr_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_try_expr_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_try_expr_def(this, result) or
       unified_try_expr_catch_clause(this, _, result) or
       unified_try_expr_modifier(this, _, result)
@@ -1226,90 +1385,115 @@ module Unified {
   }
 
   /** A class representing `tuple_expr` nodes. */
-  final class TupleExpr extends @unified_tuple_expr, AstNodeImpl {
+  class TupleExpr extends @unified_tuple_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TupleExpr" }
 
     /** Gets the node corresponding to the field `element`. */
-    final Expr getElement(int i) { unified_tuple_expr_element(this, i, result) }
+    final F::Expr getElement(int i) { unified_tuple_expr_element(this, i, result) }
+
+    /** Gets the node corresponding to the field `element`. */
+    final F::Expr getAnElement() { result = this.getElement(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_tuple_expr_element(this, _, result) }
+    final override F::AstNode getAFieldOrChild() { unified_tuple_expr_element(this, _, result) }
   }
 
   /** A class representing `tuple_pattern` nodes. */
-  final class TuplePattern extends @unified_tuple_pattern, AstNodeImpl {
+  class TuplePattern extends @unified_tuple_pattern, F::Pattern {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TuplePattern" }
 
     /** Gets the node corresponding to the field `element`. */
-    final PatternElement getElement(int i) { unified_tuple_pattern_element(this, i, result) }
+    final F::PatternElement getElement(int i) { unified_tuple_pattern_element(this, i, result) }
+
+    /** Gets the node corresponding to the field `element`. */
+    final F::PatternElement getAnElement() { result = this.getElement(_) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_tuple_pattern_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_tuple_pattern_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_tuple_pattern_element(this, _, result) or
       unified_tuple_pattern_modifier(this, _, result)
     }
   }
 
   /** A class representing `tuple_type_element` nodes. */
-  final class TupleTypeElement extends @unified_tuple_type_element, AstNodeImpl {
+  class TupleTypeElement extends @unified_tuple_type_element, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TupleTypeElement" }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_tuple_type_element_name(this, result) }
+    final F::Identifier getName() { unified_tuple_type_element_name(this, result) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_tuple_type_element_def(this, result) }
+    final F::TypeExpr getType() { unified_tuple_type_element_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_tuple_type_element_name(this, result) or unified_tuple_type_element_def(this, result)
     }
   }
 
   /** A class representing `tuple_type_expr` nodes. */
-  final class TupleTypeExpr extends @unified_tuple_type_expr, AstNodeImpl {
+  class TupleTypeExpr extends @unified_tuple_type_expr, F::TypeExpr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TupleTypeExpr" }
 
     /** Gets the node corresponding to the field `element`. */
-    final TupleTypeElement getElement(int i) { unified_tuple_type_expr_element(this, i, result) }
+    final F::TupleTypeElement getElement(int i) { unified_tuple_type_expr_element(this, i, result) }
+
+    /** Gets the node corresponding to the field `element`. */
+    final F::TupleTypeElement getAnElement() { result = this.getElement(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() { unified_tuple_type_expr_element(this, _, result) }
+    final override F::AstNode getAFieldOrChild() {
+      unified_tuple_type_expr_element(this, _, result)
+    }
   }
 
   /** A class representing `type_alias_declaration` nodes. */
-  final class TypeAliasDeclaration extends @unified_type_alias_declaration, AstNodeImpl {
+  class TypeAliasDeclaration extends @unified_type_alias_declaration, F::Member, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TypeAliasDeclaration" }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_type_alias_declaration_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) {
+      unified_type_alias_declaration_modifier(this, i, result)
+    }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_type_alias_declaration_def(this, result, _) }
+    final F::Identifier getName() { unified_type_alias_declaration_def(this, result, _) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_type_alias_declaration_def(this, _, result) }
+    final F::TypeExpr getType() { unified_type_alias_declaration_def(this, _, result) }
 
     /** Gets the node corresponding to the field `type_constraint`. */
-    final TypeConstraint getTypeConstraint(int i) {
+    final F::TypeConstraint getTypeConstraint(int i) {
       unified_type_alias_declaration_type_constraint(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `type_constraint`. */
+    final F::TypeConstraint getATypeConstraint() { result = this.getTypeConstraint(_) }
+
     /** Gets the node corresponding to the field `type_parameter`. */
-    final TypeParameter getTypeParameter(int i) {
+    final F::TypeParameter getTypeParameter(int i) {
       unified_type_alias_declaration_type_parameter(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `type_parameter`. */
+    final F::TypeParameter getATypeParameter() { result = this.getTypeParameter(_) }
+
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_type_alias_declaration_modifier(this, _, result) or
       unified_type_alias_declaration_def(this, result, _) or
       unified_type_alias_declaration_def(this, _, result) or
@@ -1319,47 +1503,50 @@ module Unified {
   }
 
   /** A class representing `type_cast_expr` nodes. */
-  final class TypeCastExpr extends @unified_type_cast_expr, AstNodeImpl {
+  class TypeCastExpr extends @unified_type_cast_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TypeCastExpr" }
 
     /** Gets the node corresponding to the field `expr`. */
-    final Expr getExpr() { unified_type_cast_expr_def(this, result, _, _) }
+    final F::Expr getExpr() { unified_type_cast_expr_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `operator`. */
-    final InfixOperator getOperator() { unified_type_cast_expr_def(this, _, result, _) }
+    final F::InfixOperator getOperator() { unified_type_cast_expr_def(this, _, result, _) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_type_cast_expr_def(this, _, _, result) }
+    final F::TypeExpr getType() { unified_type_cast_expr_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_type_cast_expr_def(this, result, _, _) or
       unified_type_cast_expr_def(this, _, result, _) or
       unified_type_cast_expr_def(this, _, _, result)
     }
   }
 
-  final class TypeConstraint extends @unified_type_constraint, AstNodeImpl { }
+  class TypeConstraint extends @unified_type_constraint, F::AstNode { }
 
-  final class TypeExpr extends @unified_type_expr, AstNodeImpl { }
+  class TypeExpr extends @unified_type_expr, F::ExprOrType { }
 
   /** A class representing `type_parameter` nodes. */
-  final class TypeParameter extends @unified_type_parameter, AstNodeImpl {
+  class TypeParameter extends @unified_type_parameter, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TypeParameter" }
 
     /** Gets the node corresponding to the field `bound`. */
-    final TypeExpr getBound() { unified_type_parameter_bound(this, result) }
+    final F::TypeExpr getBound() { unified_type_parameter_bound(this, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getModifier(int i) { unified_type_parameter_modifier(this, i, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_type_parameter_modifier(this, i, result) }
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `name`. */
-    final Identifier getName() { unified_type_parameter_def(this, result) }
+    final F::Identifier getName() { unified_type_parameter_def(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_type_parameter_bound(this, result) or
       unified_type_parameter_modifier(this, _, result) or
       unified_type_parameter_def(this, result)
@@ -1367,21 +1554,21 @@ module Unified {
   }
 
   /** A class representing `type_test_expr` nodes. */
-  final class TypeTestExpr extends @unified_type_test_expr, AstNodeImpl {
+  class TypeTestExpr extends @unified_type_test_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TypeTestExpr" }
 
     /** Gets the node corresponding to the field `expr`. */
-    final Expr getExpr() { unified_type_test_expr_def(this, result, _, _) }
+    final F::Expr getExpr() { unified_type_test_expr_def(this, result, _, _) }
 
     /** Gets the node corresponding to the field `operator`. */
-    final InfixOperator getOperator() { unified_type_test_expr_def(this, _, result, _) }
+    final F::InfixOperator getOperator() { unified_type_test_expr_def(this, _, result, _) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_type_test_expr_def(this, _, _, result) }
+    final F::TypeExpr getType() { unified_type_test_expr_def(this, _, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_type_test_expr_def(this, result, _, _) or
       unified_type_test_expr_def(this, _, result, _) or
       unified_type_test_expr_def(this, _, _, result)
@@ -1389,81 +1576,89 @@ module Unified {
   }
 
   /** A class representing `type_test_pattern` nodes. */
-  final class TypeTestPattern extends @unified_type_test_pattern, AstNodeImpl {
+  class TypeTestPattern extends @unified_type_test_pattern, F::AstNode {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "TypeTestPattern" }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_type_test_pattern_def(this, result, _) }
+    final F::Pattern getPattern() { unified_type_test_pattern_def(this, result, _) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_type_test_pattern_def(this, _, result) }
+    final F::TypeExpr getType() { unified_type_test_pattern_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_type_test_pattern_def(this, result, _) or
       unified_type_test_pattern_def(this, _, result)
     }
   }
 
   /** A class representing `unary_expr` nodes. */
-  final class UnaryExpr extends @unified_unary_expr, AstNodeImpl {
+  class UnaryExpr extends @unified_unary_expr, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UnaryExpr" }
 
     /** Gets the node corresponding to the field `operand`. */
-    final Expr getOperand() { unified_unary_expr_def(this, result, _) }
+    final F::Expr getOperand() { unified_unary_expr_def(this, result, _) }
 
     /** Gets the node corresponding to the field `operator`. */
-    final Operator getOperator() { unified_unary_expr_def(this, _, result) }
+    final F::Operator getOperator() { unified_unary_expr_def(this, _, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_unary_expr_def(this, result, _) or unified_unary_expr_def(this, _, result)
     }
   }
 
   /** A class representing `unresolved_operator_sequence` nodes. */
-  final class UnresolvedOperatorSequence extends @unified_unresolved_operator_sequence, AstNodeImpl {
+  class UnresolvedOperatorSequence extends @unified_unresolved_operator_sequence, F::Expr {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UnresolvedOperatorSequence" }
 
     /** Gets the node corresponding to the field `element`. */
-    final ExprOrOperator getElement(int i) {
+    final F::ExprOrOperator getElement(int i) {
       unified_unresolved_operator_sequence_element(this, i, result)
     }
 
+    /** Gets the node corresponding to the field `element`. */
+    final F::ExprOrOperator getAnElement() { result = this.getElement(_) }
+
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_unresolved_operator_sequence_element(this, _, result)
     }
   }
 
   /** A class representing `unsupported_node` tokens. */
-  final class UnsupportedNode extends @unified_token_unsupported_node, TokenImpl {
+  class UnsupportedNode extends @unified_token_unsupported_node, F::Expr, F::Member, F::Pattern,
+    F::Token, F::TypeExpr
+  {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "UnsupportedNode" }
   }
 
   /** A class representing `variable_declaration` nodes. */
-  final class VariableDeclaration extends @unified_variable_declaration, AstNodeImpl {
+  class VariableDeclaration extends @unified_variable_declaration, F::Member, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "VariableDeclaration" }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_variable_declaration_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_variable_declaration_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets the node corresponding to the field `pattern`. */
-    final Pattern getPattern() { unified_variable_declaration_def(this, result) }
+    final F::Pattern getPattern() { unified_variable_declaration_def(this, result) }
 
     /** Gets the node corresponding to the field `type`. */
-    final TypeExpr getType() { unified_variable_declaration_type(this, result) }
+    final F::TypeExpr getType() { unified_variable_declaration_type(this, result) }
 
     /** Gets the node corresponding to the field `value`. */
-    final Expr getValue() { unified_variable_declaration_value(this, result) }
+    final F::Expr getValue() { unified_variable_declaration_value(this, result) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_variable_declaration_modifier(this, _, result) or
       unified_variable_declaration_def(this, result) or
       unified_variable_declaration_type(this, result) or
@@ -1472,21 +1667,24 @@ module Unified {
   }
 
   /** A class representing `while_stmt` nodes. */
-  final class WhileStmt extends @unified_while_stmt, AstNodeImpl {
+  class WhileStmt extends @unified_while_stmt, F::Stmt {
     /** Gets the name of the primary QL class for this element. */
     final override string getAPrimaryQlClass() { result = "WhileStmt" }
 
     /** Gets the node corresponding to the field `body`. */
-    final Block getBody() { unified_while_stmt_body(this, result) }
+    final F::Block getBody() { unified_while_stmt_body(this, result) }
 
     /** Gets the node corresponding to the field `condition`. */
-    final Expr getCondition() { unified_while_stmt_def(this, result) }
+    final F::Expr getCondition() { unified_while_stmt_def(this, result) }
 
     /** Gets the node corresponding to the field `modifier`. */
-    final Modifier getModifier(int i) { unified_while_stmt_modifier(this, i, result) }
+    final F::Modifier getModifier(int i) { unified_while_stmt_modifier(this, i, result) }
+
+    /** Gets the node corresponding to the field `modifier`. */
+    final F::Modifier getAModifier() { result = this.getModifier(_) }
 
     /** Gets a field or child node of this node. */
-    final override AstNode getAFieldOrChild() {
+    final override F::AstNode getAFieldOrChild() {
       unified_while_stmt_body(this, result) or
       unified_while_stmt_def(this, result) or
       unified_while_stmt_modifier(this, _, result)
@@ -1496,7 +1694,7 @@ module Unified {
   /** Provides predicates for mapping AST nodes to their named children. */
   module PrintAst {
     /** Gets a child of `node` returned by the member predicate with the given `name`. If the predicate takes an index argument, `i` is bound to that index, otherwise `i` is `-1` (which is never a valid index). */
-    AstNode getChild(AstNode node, string name, int i) {
+    F::AstNode getChild(F::AstNode node, string name, int i) {
       result = node.(AccessorDeclaration).getAccessorKind() and i = -1 and name = "getAccessorKind"
       or
       result = node.(AccessorDeclaration).getBody() and i = -1 and name = "getBody"
@@ -1825,3 +2023,196 @@ module Unified {
     }
   }
 }
+
+module UnifiedFinal {
+  private import FacadeAst::Unified as F
+  import F
+
+  final class AstNode = F::AstNode;
+
+  final class Token = F::Token;
+
+  final class TriviaToken = F::TriviaToken;
+
+  final class AccessorDeclaration = F::AccessorDeclaration;
+
+  final class AccessorKind = F::AccessorKind;
+
+  final class Argument = F::Argument;
+
+  final class ArrayLiteral = F::ArrayLiteral;
+
+  final class AssignExpr = F::AssignExpr;
+
+  final class AssociatedTypeDeclaration = F::AssociatedTypeDeclaration;
+
+  final class BaseType = F::BaseType;
+
+  final class BinaryExpr = F::BinaryExpr;
+
+  final class Block = F::Block;
+
+  final class BooleanLiteral = F::BooleanLiteral;
+
+  final class BoundTypeConstraint = F::BoundTypeConstraint;
+
+  final class BreakExpr = F::BreakExpr;
+
+  final class BuiltinExpr = F::BuiltinExpr;
+
+  final class BulkImportingPattern = F::BulkImportingPattern;
+
+  final class CallExpr = F::CallExpr;
+
+  final class CatchClause = F::CatchClause;
+
+  final class ClassLikeDeclaration = F::ClassLikeDeclaration;
+
+  final class CompoundAssignExpr = F::CompoundAssignExpr;
+
+  final class ConditionalPattern = F::ConditionalPattern;
+
+  final class ConstructorDeclaration = F::ConstructorDeclaration;
+
+  final class ConstructorPattern = F::ConstructorPattern;
+
+  final class ContinueExpr = F::ContinueExpr;
+
+  final class DestructorDeclaration = F::DestructorDeclaration;
+
+  final class DoWhileStmt = F::DoWhileStmt;
+
+  final class EmptyExpr = F::EmptyExpr;
+
+  final class EqualityTypeConstraint = F::EqualityTypeConstraint;
+
+  final class Expr = F::Expr;
+
+  final class ExprEqualityPattern = F::ExprEqualityPattern;
+
+  final class ExprOrOperator = F::ExprOrOperator;
+
+  final class ExprOrPattern = F::ExprOrPattern;
+
+  final class ExprOrType = F::ExprOrType;
+
+  final class Fixity = F::Fixity;
+
+  final class FloatLiteral = F::FloatLiteral;
+
+  final class ForEachStmt = F::ForEachStmt;
+
+  final class FunctionDeclaration = F::FunctionDeclaration;
+
+  final class FunctionExpr = F::FunctionExpr;
+
+  final class FunctionTypeExpr = F::FunctionTypeExpr;
+
+  final class GenericTypeExpr = F::GenericTypeExpr;
+
+  final class GuardIfStmt = F::GuardIfStmt;
+
+  final class Identifier = F::Identifier;
+
+  final class IfExpr = F::IfExpr;
+
+  final class IgnorePattern = F::IgnorePattern;
+
+  final class ImportDeclaration = F::ImportDeclaration;
+
+  final class InferredTypeExpr = F::InferredTypeExpr;
+
+  final class InfixOperator = F::InfixOperator;
+
+  final class InitializerDeclaration = F::InitializerDeclaration;
+
+  final class IntLiteral = F::IntLiteral;
+
+  final class KeyValuePair = F::KeyValuePair;
+
+  final class LabeledStmt = F::LabeledStmt;
+
+  final class MapLiteral = F::MapLiteral;
+
+  final class Member = F::Member;
+
+  final class MemberAccessExpr = F::MemberAccessExpr;
+
+  final class Modifier = F::Modifier;
+
+  final class NameExpr = F::NameExpr;
+
+  final class NamePattern = F::NamePattern;
+
+  final class NamedTypeExpr = F::NamedTypeExpr;
+
+  final class Operator = F::Operator;
+
+  final class OperatorSyntaxDeclaration = F::OperatorSyntaxDeclaration;
+
+  final class OrPattern = F::OrPattern;
+
+  final class Parameter = F::Parameter;
+
+  final class Pattern = F::Pattern;
+
+  final class PatternElement = F::PatternElement;
+
+  final class PatternGuardExpr = F::PatternGuardExpr;
+
+  final class PostfixOperator = F::PostfixOperator;
+
+  final class PrefixOperator = F::PrefixOperator;
+
+  final class RegexLiteral = F::RegexLiteral;
+
+  final class ReturnExpr = F::ReturnExpr;
+
+  final class Stmt = F::Stmt;
+
+  final class StringLiteral = F::StringLiteral;
+
+  final class SuperExpr = F::SuperExpr;
+
+  final class SwitchCase = F::SwitchCase;
+
+  final class SwitchExpr = F::SwitchExpr;
+
+  final class ThrowExpr = F::ThrowExpr;
+
+  final class TopLevel = F::TopLevel;
+
+  final class TryExpr = F::TryExpr;
+
+  final class TupleExpr = F::TupleExpr;
+
+  final class TuplePattern = F::TuplePattern;
+
+  final class TupleTypeElement = F::TupleTypeElement;
+
+  final class TupleTypeExpr = F::TupleTypeExpr;
+
+  final class TypeAliasDeclaration = F::TypeAliasDeclaration;
+
+  final class TypeCastExpr = F::TypeCastExpr;
+
+  final class TypeConstraint = F::TypeConstraint;
+
+  final class TypeExpr = F::TypeExpr;
+
+  final class TypeParameter = F::TypeParameter;
+
+  final class TypeTestExpr = F::TypeTestExpr;
+
+  final class TypeTestPattern = F::TypeTestPattern;
+
+  final class UnaryExpr = F::UnaryExpr;
+
+  final class UnresolvedOperatorSequence = F::UnresolvedOperatorSequence;
+
+  final class UnsupportedNode = F::UnsupportedNode;
+
+  final class VariableDeclaration = F::VariableDeclaration;
+
+  final class WhileStmt = F::WhileStmt;
+}
diff --git a/unified/ql/lib/codeql/unified/internal/FacadeAst.qll b/unified/ql/lib/codeql/unified/internal/FacadeAst.qll
new file mode 100644
index 000000000000..a25fb3447c1e
--- /dev/null
+++ b/unified/ql/lib/codeql/unified/internal/FacadeAst.qll
@@ -0,0 +1,31 @@
+/**
+ * Provides facade AST classes, with additional hand-written members on top of the generated ones.
+ */
+overlay[local?]
+module;
+
+module Unified {
+  private import Ast::Unified as G
+  import G
+
+  /** The base class for all AST nodes. */
+  class AstNode extends G::AstNode {
+    /** Holds if this AST node has a modifier with the given text. */
+    predicate hasModifier(string text) {
+      exists(Modifier mod |
+        mod.getParent() = this and
+        mod.getValue() = text
+      )
+    }
+  }
+
+  /** The base class for all patterns. */
+  class Pattern extends G::Pattern {
+    /** Gets the immediately-enclosing pattern in which this is a nested pattern. */
+    Pattern getEnclosingPattern() {
+      result = this.getParent()
+      or
+      result = this.getParent().(PatternElement).getParent()
+    }
+  }
+}
diff --git a/unified/ql/lib/codeql/unified/internal/Variables.qll b/unified/ql/lib/codeql/unified/internal/Variables.qll
index 539f19930dc6..49cad56d05db 100644
--- a/unified/ql/lib/codeql/unified/internal/Variables.qll
+++ b/unified/ql/lib/codeql/unified/internal/Variables.qll
@@ -192,25 +192,7 @@ private module LocalNameBindingInput implements LocalNameBindingInputSig<Locatio
       pattern = stmt.getPattern()
     )
     or
-    exists(TuplePattern pat |
-      bindingContext(pat, scope) and
-      pattern = pat.getElement(_).getPattern()
-    )
-    or
-    exists(ConstructorPattern pat |
-      bindingContext(pat, scope) and
-      pattern = pat.getElement(_).getPattern()
-    )
-    or
-    exists(OrPattern pat |
-      bindingContext(pat, scope) and
-      pattern = pat.getPattern(_)
-    )
-    or
-    exists(ConditionalPattern pat |
-      bindingContext(pat, scope) and
-      pattern = pat.getPattern()
-    )
+    bindingContext(pattern.(Pattern).getEnclosingPattern(), scope)
     or
     exists(PatternGuardExpr expr |
       pattern = expr.getPattern() and
@@ -230,11 +212,8 @@ private module LocalNameBindingInput implements LocalNameBindingInputSig<Locatio
   private OrPattern getEnclosingOrPattern(Pattern p) {
     p = result.getPattern(_)
     or
-    exists(Pattern parent | result = getEnclosingOrPattern(parent) |
-      p = parent.(ConstructorPattern).getElement(_).getPattern()
-      or
-      p = parent.(TuplePattern).getElement(_).getPattern()
-    )
+    not p instanceof OrPattern and
+    result = getEnclosingOrPattern(p.getEnclosingPattern())
   }
 
   predicate declInScope(AstNode definingNode, string name, AstNode scope) {
diff --git a/unified/ql/lib/unified.qll b/unified/ql/lib/unified.qll
index 477ac22f3661..fad4b3ef9e67 100644
--- a/unified/ql/lib/unified.qll
+++ b/unified/ql/lib/unified.qll
@@ -4,6 +4,6 @@
 
 import codeql.Locations
 import codeql.files.FileSystem
-import codeql.unified.Ast::Unified
+import codeql.unified.internal.Ast::UnifiedFinal
 import codeql.unified.internal.AstExtra::Public
 import codeql.unified.internal.Variables::Public
diff --git a/unified/ql/test/library-tests/BasicTest/test.ql b/unified/ql/test/library-tests/BasicTest/test.ql
index ca422d039781..5e70f9303687 100644
--- a/unified/ql/test/library-tests/BasicTest/test.ql
+++ b/unified/ql/test/library-tests/BasicTest/test.ql
@@ -1,4 +1,4 @@
-import codeql.unified.Ast::Unified
+import unified
 
 query predicate nameExpr(NameExpr node, string value) { value = node.getIdentifier().getValue() }
 
diff --git a/unified/ql/test/library-tests/variables/test.swift b/unified/ql/test/library-tests/variables/test.swift
index 35aac75d393f..e4280dc5b408 100644
--- a/unified/ql/test/library-tests/variables/test.swift
+++ b/unified/ql/test/library-tests/variables/test.swift
@@ -343,11 +343,14 @@ enum E38 {
 }
 
 // Switch with a multi-pattern case that binds 'x' in each pattern
-// Note: the testing framework does not make it possible to name the 'x' variable in this case.
 func t38(value: E38) {
     switch value { // $ access=value
-    case .a(let x), // $ access=x
-         .b(let x): // $ access=x
-        print(x) // $ access=x
+    case .a(let x), // $ access=x1 // name=x1
+         .b(let x): // $ access=x1
+        print(x) // $ access=x1
+
+    case .a(let y) where y < 1, // $ access=y1 // name=y1
+         .b(let y): // $ access=y1
+        print(y) // $ access=y1
     }
 }
diff --git a/unified/ql/test/library-tests/variables/variables.expected b/unified/ql/test/library-tests/variables/variables.expected
index e69de29bb2d1..3bbfe8e89ddf 100644
--- a/unified/ql/test/library-tests/variables/variables.expected
+++ b/unified/ql/test/library-tests/variables/variables.expected
@@ -0,0 +1,2 @@
+testFailures
+ambiguousVariable
diff --git a/unified/ql/test/library-tests/variables/variables.ql b/unified/ql/test/library-tests/variables/variables.ql
index 146da296ae74..cf653afebd9d 100644
--- a/unified/ql/test/library-tests/variables/variables.ql
+++ b/unified/ql/test/library-tests/variables/variables.ql
@@ -23,8 +23,8 @@ predicate keyValueCommentAt(string filepath, int line, string key, string value)
 module VariableAccessTest implements TestSig {
   string getARelevantTag() { result = "access" }
 
-  private predicate declAt(Variable v, string filepath, int line) {
-    v.getLocation().hasLocationInfo(filepath, _, _, line, _)
+  additional predicate declAt(Variable v, string filepath, int line) {
+    v.getLocation().hasLocationInfo(filepath, line, _, _, _)
   }
 
   private predicate decl(Variable v, string alias) {
@@ -49,3 +49,13 @@ module VariableAccessTest implements TestSig {
 }
 
 import MakeTest<VariableAccessTest>
+
+private Variable getVariableAt(string name, string filepath, int line) {
+  VariableAccessTest::declAt(result, filepath, line) and
+  result.getName() = name
+}
+
+query predicate ambiguousVariable(Variable v, string name, string filepath, int line) {
+  v = getVariableAt(name, filepath, line) and
+  strictcount(getVariableAt(name, filepath, line)) >= 2
+}
diff --git a/unified/scripts/create-extractor-pack.sh b/unified/scripts/create-extractor-pack.sh
index 7a41092e4a74..3c22b0e6cbfd 100755
--- a/unified/scripts/create-extractor-pack.sh
+++ b/unified/scripts/create-extractor-pack.sh
@@ -14,9 +14,9 @@ cd "$(dirname "$0")/.."
 
 # we are in a cargo workspace rooted at the git checkout
 BIN_DIR=../target/release
-"$BIN_DIR/codeql-extractor-unified" generate --dbscheme ql/lib/unified.dbscheme --library ql/lib/codeql/unified/Ast.qll
+"$BIN_DIR/codeql-extractor-unified" generate --dbscheme ql/lib/unified.dbscheme --library ql/lib/codeql/unified/internal/Ast.qll
 
-codeql query format -i ql/lib/codeql/unified/Ast.qll
+codeql query format -i ql/lib/codeql/unified/internal/Ast.qll
 
 rm -rf extractor-pack
 mkdir -p extractor-pack