gh-94996: Disallow parsing pos only params with feature_version < (3, 8) (GH-94997)

1 files changed, 9 insertions, 1 deletions

diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index de34ccf..2f3e9d5 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -738,6 +738,14 @@ class AST_Tests(unittest.TestCase):
         expressions[0] = f"expr = {ast.expr.__subclasses__()[0].__doc__}"
         self.assertCountEqual(ast.expr.__doc__.split("\n"), expressions)
 
+    def test_positional_only_feature_version(self):
+        ast.parse('def foo(x, /): ...', feature_version=(3, 8))
+        ast.parse('def bar(x=1, /): ...', feature_version=(3, 8))
+        with self.assertRaises(SyntaxError):
+            ast.parse('def foo(x, /): ...', feature_version=(3, 7))
+        with self.assertRaises(SyntaxError):
+            ast.parse('def bar(x=1, /): ...', feature_version=(3, 7))
+
     def test_parenthesized_with_feature_version(self):
         ast.parse('with (CtxManager() as example): ...', feature_version=(3, 10))
         # While advertised as a feature in Python 3.10, this was allowed starting 3.9
@@ -746,7 +754,7 @@ class AST_Tests(unittest.TestCase):
             ast.parse('with (CtxManager() as example): ...', feature_version=(3, 8))
         ast.parse('with CtxManager() as example: ...', feature_version=(3, 8))
 
-    def test_issue40614_feature_version(self):
+    def test_debug_f_string_feature_version(self):
         ast.parse('f"{x=}"', feature_version=(3, 8))
         with self.assertRaises(SyntaxError):
             ast.parse('f"{x=}"', feature_version=(3, 7))