Improved validation of generator return type. Previously, the check w… #5973
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…as performed only for `yield` statements, but it's possible to define a generator function that has no reachable yield statements. This addresses #5972.
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Diff from mypy_primer, showing the effect of this PR on open source code: steam.py (https://github.com/Gobot1234/steam.py)
+ /tmp/mypy_primer/projects/steam.py/steam/utils.py:734:65 - error: Return type of generator function must be compatible with "Generator[Any, Any, Any]"
+ "Generator[Any, Any, Any]" is incompatible with "AsyncGenerator[tuple[_T@as_chunks, ...], None]" (reportGeneralTypeIssues)
- 7960 errors, 23 warnings, 0 informations
+ 7961 errors, 23 warnings, 0 informations
dd-trace-py (https://github.com/DataDog/dd-trace-py)
+ /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/asyncpg/test_asyncpg.py:24:11 - error: Return type of async generator function must be compatible with "AsyncGenerator[Any, Any]"
+ "AsyncGenerator[Any, Any, Any]" is incompatible with "Generator[Unknown, None, None]" (reportGeneralTypeIssues)
- 9093 errors, 467 warnings, 0 informations
+ 9094 errors, 467 warnings, 0 informations
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…as performed only for
yieldstatements, but it's possible to define a generator function that has no reachable yield statements. This addresses #5972.