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Add undocumented trait decorator to mypy_extensions (#2369)

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`@trait` has special meaning to the experimental mypyc compiler,
slightly restricting the behavior of the class in exchange for
allowing it to be multiply inherited from.
This commit is contained in:
Michael J. Sullivan
2018-08-07 22:18:00 -07:00
committed by Jelle Zijlstra
parent 631d2768d6
commit e4656b1ac6
1 changed files with 5 additions and 1 deletions
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6
third_party/2and3/mypy_extensions.pyi vendored
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@@ -1,4 +1,4 @@
from typing import Dict, Type, TypeVar, Optional, Union
from typing import Dict, Type, TypeVar, Optional, Union, Any
_T = TypeVar('_T')
@@ -15,3 +15,7 @@ def KwArg(type: _T = ...) -> _T: ...
# This type is equivalent to the None type, but the no-op Union is necessary to
# distinguish the None type from the None value.
NoReturn = Union[None] # Deprecated: Use typing.NoReturn instead.
# This is intended as a class decorator, but mypy rejects abstract classes
# when a Type[_T] is expected, so we can't give it the type we want
def trait(cls: Any) -> Any: ...