From f65f9e80fe741c894582a3e413d4e3318c1ed626 Mon Sep 17 00:00:00 2001
From: Nikita Sobolev <mail@sobolevn.me>
Date: Thu, 28 Sep 2023 05:26:42 +0300
Subject: [PATCH] gh-109818: `reprlib.recursive_repr` copies `__type_params__`
 (#109819)

---
 Lib/reprlib.py                                        |  1 +
 Lib/test/test_reprlib.py                              | 11 +++++++++++
 .../2023-09-25-09-59-59.gh-issue-109818.dLRtT-.rst    |  2 ++
 3 files changed, 14 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2023-09-25-09-59-59.gh-issue-109818.dLRtT-.rst

diff --git a/Lib/reprlib.py b/Lib/reprlib.py
index 840dd0e2013..05bb1a0eb01 100644
--- a/Lib/reprlib.py
+++ b/Lib/reprlib.py
@@ -29,6 +29,7 @@ def recursive_repr(fillvalue='...'):
         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__', ())
         wrapper.__wrapped__ = user_function
         return wrapper
 
diff --git a/Lib/test/test_reprlib.py b/Lib/test/test_reprlib.py
index 502287b620d..3e93b561c14 100644
--- a/Lib/test/test_reprlib.py
+++ b/Lib/test/test_reprlib.py
@@ -774,5 +774,16 @@ class TestRecursiveRepr(unittest.TestCase):
 
         self.assertIs(X.f, X.__repr__.__wrapped__)
 
+    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()
diff --git a/Misc/NEWS.d/next/Library/2023-09-25-09-59-59.gh-issue-109818.dLRtT-.rst b/Misc/NEWS.d/next/Library/2023-09-25-09-59-59.gh-issue-109818.dLRtT-.rst
new file mode 100644
index 00000000000..184086af258
--- /dev/null
+++ b/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.