8000 Disallow to use `TypeGuard` type outside of `.ret_type`, refs #11765 by sobolevn · Pull Request #11790 · python/mypy · GitHub
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Disallow to use TypeGuard type outside of .ret_type, refs #11765 #11790

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Disallow to use TypeGuard type outside of .ret_type, refs #11765 #11790

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Disallow to use `TypeGuard` type outside of `.ret_type`, refs #11765
sobolevn Dec 18, 2021
6723a61
Addresses review
sobolevn Dec 18, 2021
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Addresses review
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@sobolevn
sobolevn committed Dec 18, 2021
commit 6723a619d7f9215d6f1356a63eab41bcfc591b4a
4 changes: 4 additions & 0 deletions test-data/unit/check-typeguard.test
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Expand Up @@ -55,10 +55,14 @@ def main(a: object, b: object) -> None:
[builtins fixtures/tuple.pyi]

[case testTypeGuardIsBool]
from typing import List
from typing_extensions import TypeGuard
def f(a: TypeGuard[int]) -> None: # E: TypeGuard must only be used as a return type
pass
reveal_type(f) # N: Revealed type is "def (a: builtins.bool)"
def f1() -> List[TypeGuard[int]]: # E: TypeGuard must only be used as a return type
pass
reveal_type(f1()) # N: Revealed type is "builtins.list[builtins.bool]"
a: TypeGuard[int] # E: TypeGuard must only be used as a return type
reveal_type(a) # N: Revealed type is "builtins.bool"
class C:
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