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Handle NoReturn type aliases #11912

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merged 3 commits into from Jan 6, 2022
Merged

Handle NoReturn type aliases #11912

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155d412
Handle `NoReturn` type alises
sobolevn Jan 5, 2022
c93e0d2
Docs
sobolevn Jan 5, 2022
83eb035
Update test-data/unit/check-type-aliases.test
hauntsaninja Jan 6, 2022
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6 changes: 6 additions & 0 deletions mypy/semanal.py
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Expand Up @@ -2247,6 +2247,12 @@ def is_type_ref(self, rv: Expression, bare: bool = False) -> bool:
return True
# Assignment color = Color['RED'] defines a variable, not an alias.
return not rv.node.is_enum
if isinstance(rv.node, Var):
return rv.node.fullname in (
'typing.NoReturn',
'typing_extensions.NoReturn',
'mypy_extensions.NoReturn',
)

if isinstance(rv, NameExpr):
n = self.lookup(rv.name, rv)
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8 changes: 8 additions & 0 deletions test-data/unit/check-type-aliases.test
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Expand Up @@ -50,6 +50,14 @@ def f(x: A) -> None:
f(1)
f('x')

[case testNoReturnTypeAlias]
# https://github.com/python/mypy/issues/11903
from typing import NoReturn
Never = NoReturn
a: Never # Used to be an error here

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def f(a: Never): ...
f(5) # E: Argument 1 to "f" has incompatible type "int"; expected "NoReturn"
[case testImportUnionAlias]
import typing
from _m import U
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