gh-94947: Disallow parsing walrus with feature_version < (3, 8) (#94948)

* gh-94947: Disallow parsing walrus with feature_version < (3, 8)

* oops, commit the parser

* 📜🤖 Added by blurb_it.

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 2258924..5d7e441 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -743,6 +743,11 @@ class AST_Tests(unittest.TestCase):
         with self.assertRaises(SyntaxError):
             ast.parse('f"{x=}"', feature_version=(3, 7))
 
+    def test_assignment_expression_feature_version(self):
+        ast.parse('(x := 0)', feature_version=(3, 8))
+        with self.assertRaises(SyntaxError):
+            ast.parse('(x := 0)', feature_version=(3, 7))
+
     def test_constant_as_name(self):
         for constant in "True", "False", "None":
             expr = ast.Expression(ast.Name(constant, ast.Load()))