Don't narrow Type[X] with a metaclass #10424
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We could narrow `Type[T]` to `<nothing>` when tested against a metaclass, which is not useful. Now we don't do any narrowing in this case. Fixes #10423.
ilevkivskyi
approved these changes
May 5, 2021
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Diff from mypy_primer, showing the effect of this PR on open source code: sphinx (https://github.com/sphinx-doc/sphinx.git)
+ sphinx/util/typing.py:226: error: unused 'type: ignore' comment
+ sphinx/util/typing.py:227: error: unused 'type: ignore' comment
+ sphinx/util/typing.py:228: error: unused 'type: ignore' comment
+ sphinx/util/typing.py:229: error: unused 'type: ignore' comment
+ sphinx/util/typing.py:231: error: unused 'type: ignore' comment
+ sphinx/util/typing.py:232: error: unused 'type: ignore' comment
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We could narrow
Type[T]to<nothing>when tested against ametaclass, which is not useful. Now we don't do any narrowing
in this case.
Fixes #10423.