gh-96478: Test @overload on C functions (GH-96479)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
(cherry picked from commit f177f6f)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

Lib/test/test_typing.py

@@ -4379,6 +4379,20 @@ def blah():
 
         blah()
 
+    @patch("typing._overload_registry",
+        defaultdict(lambda: defaultdict(dict)))
+    def test_overload_on_compiled_functions(self):
+        # The registry starts out empty:
+        self.assertEqual(typing._overload_registry, {})
+
+        # This should just not fail:
+        overload(sum)
+        overload(print)
+
+        # No overloads are recorded (but, it still has a side-effect):
+        self.assertEqual(typing.get_overloads(sum), [])
+        self.assertEqual(typing.get_overloads(print), [])
+
     def set_up_overloads(self):
         def blah():
             pass