[3.13] gh-121332: Make AST node constructor check _attributes instead of hardcoding attributes (GH-121334) (#121625)

(cherry picked from commit 58e8cf2bb61f82df9eabd1209fe5e3d146e4c8cd)

1 files changed, 12 insertions, 0 deletions

diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 93bd5de..744cd23 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -3148,6 +3148,18 @@ class ASTConstructorTests(unittest.TestCase):
         obj = FieldsAndTypes(a=1)
         self.assertEqual(obj.a, 1)
 
+    def test_custom_attributes(self):
+        class MyAttrs(ast.AST):
+            _attributes = ("a", "b")
+
+        obj = MyAttrs(a=1, b=2)
+        self.assertEqual(obj.a, 1)
+        self.assertEqual(obj.b, 2)
+
+        with self.assertWarnsRegex(DeprecationWarning,
+                                   r"MyAttrs.__init__ got an unexpected keyword argument 'c'."):
+            obj = MyAttrs(c=3)
+
     def test_fields_and_types_no_default(self):
         class FieldsAndTypesNoDefault(ast.AST):
             _fields = ('a',)