Handle PEP 604 unions in stubgen inspect mode#21775
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Summary
Fixes
stubgen --inspect-modecrashing when runtime annotations contain PEP 604 unions such asint | str.Runtime inspection sees those annotations as
types.UnionType, which does not define__name__.InspectionStubGenerator.get_type_fullname()now handles runtime union objects recursively and renderstype(None)asNone, so signatures likefloat | Nonestay valid in generated stubs.Fixes #21689.
Test Plan
python -m pytest mypy/test/teststubgen.py::StubgencSuite::test_non_c_generate_signature_with_pep604_union -qpython -m pytest mypy/test/teststubgen.py::StubgencSuite -qpython -m py_compile mypy/stubgenc.py mypy/test/teststubgen.pypython -m black --fast --check mypy/stubgenc.py mypy/test/teststubgen.pypython -m ruff check mypy/stubgenc.py mypy/test/teststubgen.pygit diff --check