[3.10] gh-94996: Disallow lambda pos only params with feature_version < (3, 8) (GH...

(cherry picked from commit a965db37f27ffb232312bc13d9a509f0d93fcd20)

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Automerge-Triggered-By: GH:lysnikolaou

diff --git a/Grammar/python.gram b/Grammar/python.gram
index dcba7ad61b553caba9d9765cd6a7445fce5d3c97..de582d2b82ae0476a1e3d87b25b2ce4e5fda8259 100644 (file)
--- a/Grammar/python.gram
+++ b/Grammar/python.gram
@@ -552,9 +552,9 @@ lambda_params[arguments_ty]:
 #
 lambda_parameters[arguments_ty]:
     | a=lambda_slash_no_default b[asdl_arg_seq*]=lambda_param_no_default* c=lambda_param_with_default* d=[lambda_star_etc] {
-        _PyPegen_make_arguments(p, a, NULL, b, c, d) }
+        CHECK_VERSION(arguments_ty, 8, "Positional-only parameters are", _PyPegen_make_arguments(p, a, NULL, b, c, d)) }
     | a=lambda_slash_with_default b=lambda_param_with_default* c=[lambda_star_etc] {
-        _PyPegen_make_arguments(p, NULL, a, NULL, b, c) }
+        CHECK_VERSION(arguments_ty, 8, "Positional-only parameters are", _PyPegen_make_arguments(p, NULL, a, NULL, b, c)) }
     | a[asdl_arg_seq*]=lambda_param_no_default+ b=lambda_param_with_default* c=[lambda_star_etc] {
         _PyPegen_make_arguments(p, NULL, NULL, a, b, c) }
     | a=lambda_param_with_default+ b=[lambda_star_etc] { _PyPegen_make_arguments(p, NULL, NULL, NULL, a, b)}

diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 5bbee8c4c48593e773d7905b834870315dd07ecf..03e43f74ee2d447af490f9b4fd9ac104bfa0525e 100644 (file)
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -694,6 +694,13 @@ 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

diff --git a/Parser/parser.c b/Parser/parser.c
index cadb295de696af266cece1af32229ed5fb698f0e..458ada0e52b857737c6cb11a9f65b784fe3e1f6c 100644 (file)
--- a/Parser/parser.c
+++ b/Parser/parser.c
@@ -11194,7 +11194,7 @@ lambda_parameters_rule(Parser *p)
         )
         {
             D(fprintf(stderr, "%*c+ lambda_parameters[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "lambda_slash_no_default lambda_param_no_default* lambda_param_with_default* lambda_star_etc?"));
-            _res = _PyPegen_make_arguments ( p , a , NULL , b , c , d );
+            _res = CHECK_VERSION ( arguments_ty , 8 , "Positional-only parameters are" , _PyPegen_make_arguments ( p , a , NULL , b , c , d ) );
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
                 p->level--;
@@ -11224,7 +11224,7 @@ lambda_parameters_rule(Parser *p)
         )
         {
             D(fprintf(stderr, "%*c+ lambda_parameters[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "lambda_slash_with_default lambda_param_with_default* lambda_star_etc?"));
-            _res = _PyPegen_make_arguments ( p , NULL , a , NULL , b , c );
+            _res = CHECK_VERSION ( arguments_ty , 8 , "Positional-only parameters are" , _PyPegen_make_arguments ( p , NULL , a , NULL , b , c ) );
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
                 p->level--;