From fef5536dfcb717a9c38d4a7ff95ad3b7e266eb9d Mon Sep 17 00:00:00 2001
From: hauntsaninja <hauntsaninja@gmail.com>
Date: Sun, 17 Jul 2022 21:24:50 -0700
Subject: [PATCH 1/3] gh-94947: Disallow parsing walrus with feature_version <
 (3, 8)

---
 Grammar/python.gram  | 4 +++-
 Lib/test/test_ast.py | 5 +++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Grammar/python.gram b/Grammar/python.gram
index 91d73a9fffd193..6a8bb942fffcc5 100644
--- a/Grammar/python.gram
+++ b/Grammar/python.gram
@@ -660,7 +660,9 @@ star_named_expression[expr_ty]:
     | named_expression
 
 assignment_expression[expr_ty]:
-    | a=NAME ':=' ~ b=expression { _PyAST_NamedExpr(CHECK(expr_ty, _PyPegen_set_expr_context(p, a, Store)), b, EXTRA) }
+    | a=NAME ':=' ~ b=expression {
+        CHECK_VERSION(expr_ty, 8, "Assignment expressions are",
+        _PyAST_NamedExpr(CHECK(expr_ty, _PyPegen_set_expr_context(p, a, Store)), b, EXTRA)) }
 
 named_expression[expr_ty]:
     | assignment_expression
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 225892414b8c19..5d7e4419560b81 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -743,6 +743,11 @@ def test_issue40614_feature_version(self):
         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()))

From 782f266064fe980d0e20e7803aa4fd8262a1fba5 Mon Sep 17 00:00:00 2001
From: hauntsaninja <hauntsaninja@gmail.com>
Date: Sun, 17 Jul 2022 21:47:19 -0700
Subject: [PATCH 2/3] oops, commit the parser

---
 Parser/parser.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Parser/parser.c b/Parser/parser.c
index 3d59d4a704c239..309c249141d71e 100644
--- a/Parser/parser.c
+++ b/Parser/parser.c
@@ -11223,7 +11223,7 @@ assignment_expression_rule(Parser *p)
             UNUSED(_end_lineno); // Only used by EXTRA macro
             int _end_col_offset = _token->end_col_offset;
             UNUSED(_end_col_offset); // Only used by EXTRA macro
-            _res = _PyAST_NamedExpr ( CHECK ( expr_ty , _PyPegen_set_expr_context ( p , a , Store ) ) , b , EXTRA );
+            _res = CHECK_VERSION ( expr_ty , 8 , "Assignment expressions are" , _PyAST_NamedExpr ( CHECK ( expr_ty , _PyPegen_set_expr_context ( p , a , Store ) ) , b , EXTRA ) );
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
                 p->level--;

From 5adf546da72a534e7dcbf0eae51d54a1c01e134e Mon Sep 17 00:00:00 2001
From: "blurb-it[bot]" <43283697+blurb-it[bot]@users.noreply.github.com>
Date: Mon, 18 Jul 2022 04:48:37 +0000
Subject: [PATCH 3/3] =?UTF-8?q?=F0=9F=93=9C=F0=9F=A4=96=20Added=20by=20blu?=
 =?UTF-8?q?rb=5Fit.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../2022-07-18-04-48-34.gh-issue-94947.df9gUw.rst                | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2022-07-18-04-48-34.gh-issue-94947.df9gUw.rst

diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-07-18-04-48-34.gh-issue-94947.df9gUw.rst b/Misc/NEWS.d/next/Core and Builtins/2022-07-18-04-48-34.gh-issue-94947.df9gUw.rst
new file mode 100644
index 00000000000000..360ea67048fe22
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-07-18-04-48-34.gh-issue-94947.df9gUw.rst	
@@ -0,0 +1 @@
+:func:`ast.parse` will no longer parse assignment expressions when passed ``feature_version`` less than ``(3, 8)``. Patch by Shantanu Jain.