Revert "pythongh-94949: Disallow parsing parenthesised ctx mgr with old feature_version (python#94950)"

This reverts commit 0daba82.

Author: AlexWaygood

Grammar/python.gram

@@ -393,7 +393,7 @@ for_stmt[stmt_ty]:
 with_stmt[stmt_ty]:
     | invalid_with_stmt_indent
     | 'with' '(' a[asdl_withitem_seq*]=','.with_item+ ','? ')' ':' tc=[TYPE_COMMENT] b=block {
-       CHECK_VERSION(stmt_ty, 9, "Parenthesized context managers are", _PyAST_With(a, b, NEW_TYPE_COMMENT(p, tc), EXTRA)) }
+       _PyAST_With(a, b, NEW_TYPE_COMMENT(p, tc), EXTRA) }
     | 'with' a[asdl_withitem_seq*]=','.with_item+ ':' tc=[TYPE_COMMENT] b=block {
         _PyAST_With(a, b, NEW_TYPE_COMMENT(p, tc), EXTRA) }
     | 'async' 'with' '(' a[asdl_withitem_seq*]=','.with_item+ ','? ')' ':' b=block {

Lib/test/test_ast.py

@@ -1045,14 +1045,6 @@ def test_positional_only_feature_version(self):
         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
-        ast.parse('with (CtxManager() as example): ...', feature_version=(3, 9))
-        with self.assertRaises(SyntaxError):
-            ast.parse('with (CtxManager() as example): ...', feature_version=(3, 8))
-        ast.parse('with CtxManager() as example: ...', feature_version=(3, 8))
-
     def test_assignment_expression_feature_version(self):
         ast.parse('(x := 0)', feature_version=(3, 8))
         with self.assertRaises(SyntaxError):