[3.12] gh-117613: Argument Clinic: ensure that defining class params are positional-only (#117939)

1 files changed, 22 insertions, 0 deletions

diff --git a/Lib/test/test_clinic.py b/Lib/test/test_clinic.py
index 3a0ff94..c114a62 100644
--- a/Lib/test/test_clinic.py
+++ b/Lib/test/test_clinic.py
@@ -1347,6 +1347,28 @@ class ClinicParserTest(_ParserBase):
                 parser_decl = p.simple_declaration(in_parser=True)
                 self.assertNotIn("Py_UNUSED", parser_decl)
 
+    def test_kind_defining_class(self):
+        function = self.parse_function("""
+            module m
+            class m.C "PyObject *" ""
+            m.C.meth
+                cls: defining_class
+        """, signatures_in_block=3, function_index=2)
+        p = function.parameters['cls']
+        self.assertEqual(p.kind, inspect.Parameter.POSITIONAL_ONLY)
+
+    def test_disallow_defining_class_at_module_level(self):
+        expected_error_msg = (
+            "Error on line 0:\n"
+            "A 'defining_class' parameter cannot be defined at module level.\n"
+        )
+        out = self.parse_function_should_fail("""
+            module m
+            m.func
+                cls: defining_class
+        """)
+        self.assertEqual(out, expected_error_msg)
+
     def parse(self, text):
         c = FakeClinic()
         parser = DSLParser(c)