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Error isn't provided when TypeVar is defined in both outer and inner class scopes #10479

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erictraut opened this issue May 15, 2021 · 0 comments · May be fixed by #18883
Open

Error isn't provided when TypeVar is defined in both outer and inner class scopes #10479

erictraut opened this issue May 15, 2021 · 0 comments · May be fixed by #18883
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bug mypy got something wrong

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@erictraut
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PEP 484 says "A generic class nested in another generic class cannot use same type variables. The scope of the type variables of the outer class doesn't cover the inner one".

It provides the following example:

from typing import Generic, Iterable, TypeVar

T = TypeVar('T')
S = TypeVar('S')

class Outer(Generic[T]):
    class Bad(Iterable[T]):       # Error
        ...

Mypy does not emit an error in this case even though PEP 484 says it's not allowed.
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Fix missing error when redeclaring type variable in nested generic class brianschubert/mypy
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