[3.12] gh-109818: reprlib.recursive_repr copies __type_params__ (… (#109999)

[3.12] gh-109818: `reprlib.recursive_repr` copies `__type_params__` (GH-109819).
(cherry picked from commit f65f9e8)

Co-authored-by: Nikita Sobolev <[email protected]>

Author: JelleZijlstra

Lib/reprlib.py

@@ -29,6 +29,7 @@ def wrapper(self):
         wrapper.__name__ = getattr(user_function, '__name__')
         wrapper.__qualname__ = getattr(user_function, '__qualname__')
         wrapper.__annotations__ = getattr(user_function, '__annotations__', {})
+        wrapper.__type_params__ = getattr(user_function, '__type_params__', ())
         return wrapper
 
     return decorating_function

Lib/test/test_reprlib.py

@@ -765,5 +765,16 @@ def test_assigned_attributes(self):
         for name in assigned:
             self.assertIs(getattr(wrapper, name), getattr(wrapped, name))
 
+    def test__type_params__(self):
+        class My:
+            @recursive_repr()
+            def __repr__[T: str](self, default: T = '') -> str:
+                return default
+
+        type_params = My().__repr__.__type_params__
+        self.assertEqual(len(type_params), 1)
+        self.assertEqual(type_params[0].__name__, 'T')
+        self.assertEqual(type_params[0].__bound__, str)
+
 if __name__ == "__main__":
     unittest.main()

Misc/NEWS.d/next/Library/2023-09-25-09-59-59.gh-issue-109818.dLRtT-.rst

@@ -0,0 +1,2 @@
+Fix :func:`reprlib.recursive_repr` not copying ``__type_params__`` from
+decorated function.