fixup! Use TypeGuard for has in Python 3.10 and above

Author: layday

src/attr/__init__.pyi

@@ -27,6 +27,12 @@ from . import validators as validators
 from ._cmp import cmp_using as cmp_using
 from ._version_info import VersionInfo
 
+
+if sys.version_info >= (3, 10):
+    from typing import TypeGuard
+else:
+    from typing_extensions import TypeGuard
+
 __version__: str
 __version_info__: VersionInfo
 __title__: str
@@ -470,15 +476,7 @@ def astuple(
     tuple_factory: Type[Sequence[Any]] = ...,
     retain_collection_types: bool = ...,
 ) -> Tuple[Any, ...]: ...
-
-if sys.version_info >= (3, 10):
-    from typing import TypeGuard
-
-    def has(cls: type) -> TypeGuard[Type[AttrsInstance]]: ...
-
-else:
-    def has(cls: type) -> bool: ...
-
+def has(cls: type) -> TypeGuard[Type[AttrsInstance]]: ...
 def assoc(inst: _T, **changes: Any) -> _T: ...
 def evolve(inst: _T, **changes: Any) -> _T: ...
 

tests/test_mypy.yml

@@ -1373,7 +1373,6 @@
     fields(A)  # E: Argument 1 to "fields" has incompatible type "Type[A]"; expected "Type[AttrsInstance]"
 
 - case: testHasTypeGuard
-  skip: sys.version_info < (3, 10)
   main: |
     from attrs import define, has