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Regression in 1.7: mypy loses truthiness constraint for union containing tuple #16748

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hauntsaninja opened this issue Jan 5, 2024 · 0 comments
Open

Regression in 1.7: mypy loses truthiness constraint for union containing tuple #16748

hauntsaninja opened this issue Jan 5, 2024 · 0 comments
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bug mypy got something wrong topic-type-narrowing Conditional type narrowing / binder

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hauntsaninja commented Jan 5, 2024 •
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def f(x: bool | tuple[int, int]):
    if x:
        if x is True or x[0]:
            pass

Gives:

main.py:3: error: Value of type "Literal[False] | tuple[int, int]" is not indexable  [index]

This error is newly reported after #16237
@hauntsaninja hauntsaninja added the bug mypy got something wrong label Jan 5, 2024
@hauntsaninja hauntsaninja changed the title mypy loses truthiness constraint in nested if statement Regression in 1.7: mypy loses truthiness constraint in nested if statement Jan 5, 2024
@hauntsaninja hauntsaninja changed the title Regression in 1.7: mypy loses truthiness constraint in nested if statement Regression in 1.7: mypy loses truthiness constraint for union containing tuple Jan 5, 2024
@AlexWaygood AlexWaygood added the topic-type-narrowing Conditional type narrowing / binder label Jan 6, 2024
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