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TypeGuard may spuriously narrow Any -> object #10554

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JelleZijlstra opened this issue May 29, 2021 · 0 comments

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bug topic-typeguard

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JelleZijlstra commented May 29, 2021

I haven't had time to fully reduce this, but in the Sphinx code at https://github.com/sphinx-doc/sphinx/blob/1d4c414319598320f95eed245e4a2f9ad3e5a668/sphinx/ext/coverage.py#L218, the TypeGuards introduced by python/typeshed#5473 lead to an incorrect error:

+ sphinx/ext/coverage.py: note: In member "build_py_coverage" of class "CoverageBuilder":
+ sphinx/ext/coverage.py:218:51: error: Item "object" of "Union[object, object]" has no attribute "__doc__"

Seems like some bad interaction with the negative case for the TypeGuards produced by ismethod and isfunction a few lines up.

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