gh-94996: Disallow lambda pos only params with feature_version < (3, 8) (GH-95934)

1 files changed, 7 insertions, 0 deletions

diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 2f3e9d5..4cfefe4 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -746,6 +746,13 @@ class AST_Tests(unittest.TestCase):
         with self.assertRaises(SyntaxError):
             ast.parse('def bar(x=1, /): ...', feature_version=(3, 7))
 
+        ast.parse('lambda x, /: ...', feature_version=(3, 8))
+        ast.parse('lambda x=1, /: ...', feature_version=(3, 8))
+        with self.assertRaises(SyntaxError):
+            ast.parse('lambda x, /: ...', feature_version=(3, 7))
+        with self.assertRaises(SyntaxError):
+            ast.parse('lambda 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