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Mypy incorrectly accepts pass as returning List[int] #6139

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marmistrz opened this issue Jan 4, 2019 · 1 comment
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Mypy incorrectly accepts pass as returning List[int] #6139

marmistrz opened this issue Jan 4, 2019 · 1 comment

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@marmistrz
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marmistrz commented Jan 4, 2019 •
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mypy 0.650

Take the following source:

from typing import List

def foo(x: int) -> List[int]:
    pass

print(foo(3)[0])

Lint with mypy --strict test.py - nothing reported.
During runtime:

Traceback (most recent call last):
  File "test.py", line 6, in <module>
    print(foo(3)[0])
TypeError: 'NoneType' object is not subscriptable

return None instead of pass raises an error, though.
@ilevkivskyi
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This is a duplicate of #2350

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@marmistrz @ilevkivskyi