Create weakref.pyi

Author: BobTheBuidler

test-data/unit/lib-stub/weakref.pyi

@@ -0,0 +1,11 @@
+from collections.abc import Callable
+from typing import Any, Generic, TypeVar
+from typing_extensions import Self
+
+_T = TypeVar("_T")
+
+class ReferenceType(Generic[_T]):  # "weakref"
+    __callback__: Callable[[Self], Any]
+    def __new__(cls, o: _T, callback: Callable[[Self], Any] | None = ..., /) -> Self: ...
+
+ref = ReferenceType