From 714c99bbdbdc4af11ffc506e71a8c29bffb3b520 Mon Sep 17 00:00:00 2001
From: "Philipp A." <flying-sheep@web.de>
Date: Tue, 4 Mar 2025 14:52:07 +0100
Subject: [PATCH] Fix singledispatch register signature (#13578)

---
 stdlib/functools.pyi | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/stdlib/functools.pyi b/stdlib/functools.pyi
index 10563e654..f786167e3 100644
--- a/stdlib/functools.pyi
+++ b/stdlib/functools.pyi
@@ -151,20 +151,25 @@ class partialmethod(Generic[_T]):
     if sys.version_info >= (3, 9):
         def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
 
+if sys.version_info >= (3, 11):
+    _RegType: TypeAlias = type[Any] | types.UnionType
+else:
+    _RegType: TypeAlias = type[Any]
+
 class _SingleDispatchCallable(Generic[_T]):
     registry: types.MappingProxyType[Any, Callable[..., _T]]
     def dispatch(self, cls: Any) -> Callable[..., _T]: ...
     # @fun.register(complex)
     # def _(arg, verbose=False): ...
     @overload
-    def register(self, cls: type[Any], func: None = None) -> Callable[[Callable[..., _T]], Callable[..., _T]]: ...
+    def register(self, cls: _RegType, func: None = None) -> Callable[[Callable[..., _T]], Callable[..., _T]]: ...
     # @fun.register
     # def _(arg: int, verbose=False):
     @overload
     def register(self, cls: Callable[..., _T], func: None = None) -> Callable[..., _T]: ...
     # fun.register(int, lambda x: x)
     @overload
-    def register(self, cls: type[Any], func: Callable[..., _T]) -> Callable[..., _T]: ...
+    def register(self, cls: _RegType, func: Callable[..., _T]) -> Callable[..., _T]: ...
     def _clear_cache(self) -> None: ...
     def __call__(self, /, *args: Any, **kwargs: Any) -> _T: ...
 
@@ -177,11 +182,11 @@ class singledispatchmethod(Generic[_T]):
     @property
     def __isabstractmethod__(self) -> bool: ...
     @overload
-    def register(self, cls: type[Any], method: None = None) -> Callable[[Callable[..., _T]], Callable[..., _T]]: ...
+    def register(self, cls: _RegType, method: None = None) -> Callable[[Callable[..., _T]], Callable[..., _T]]: ...
     @overload
     def register(self, cls: Callable[..., _T], method: None = None) -> Callable[..., _T]: ...
     @overload
-    def register(self, cls: type[Any], method: Callable[..., _T]) -> Callable[..., _T]: ...
+    def register(self, cls: _RegType, method: Callable[..., _T]) -> Callable[..., _T]: ...
     def __get__(self, obj: _S, cls: type[_S] | None = None) -> Callable[..., _T]: ...
 
 class cached_property(Generic[_T_co]):