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Inconsistent types for variable with partial type #4484

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JukkaL opened this issue Jan 18, 2018 · 0 comments
Open

Inconsistent types for variable with partial type #4484

JukkaL opened this issue Jan 18, 2018 · 0 comments
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bug mypy got something wrong topic-fine-grained-incremental

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@JukkaL
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JukkaL commented Jan 18, 2018

In the example below the variable seemingly has two types (None and x) which is wrong. This also results in an inconsistency with fine-grained incremental mode.

x = None

def f() -> None:
    reveal_type(x)  # None
    if x:
        1()  # No error, considered as not reachable
        y = 1
    else:
        y = ''  # No error

x = 1
reveal_type(x)  # int

The expected behavior is for x to always have the type int and for every line in the example to be considered reachable.
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@JukkaL