gh-91625: Don't ignore extended args of adaptive opcodes (GH-91626)

Lib/test/test_descr.py

@@ -1961,6 +1961,20 @@ order (MRO) for bases """
         del a[0:10]
         self.assertEqual(a.delitem, (slice(0, 10)))
 
+    def test_load_attr_extended_arg(self):
+        # https://github.com/python/cpython/issues/91625
+        class Numbers:
+            def __getattr__(self, attr):
+                return int(attr.lstrip("_"))
+        attrs = ", ".join(f"Z._{n:03d}" for n in range(280))
+        code = f"def number_attrs(Z):\n    return [ {attrs} ]"
+        ns = {}
+        exec(code, ns)
+        number_attrs = ns["number_attrs"]
+        # Warm up the the function for quickening (PEP 659)
+        for _ in range(30):
+            self.assertEqual(number_attrs(Numbers()), list(range(280)))
+
     def test_methods(self):
         # Testing methods...
         class C(object):
@@ -4435,8 +4449,8 @@ order (MRO) for bases """
                 raise RuntimeError(f"Premature access to sys.stdout.{attr}")
 
         with redirect_stdout(StdoutGuard()):
-             with self.assertRaises(RuntimeError):
-                 print("Oops!")
+            with self.assertRaises(RuntimeError):
+                print("Oops!")
 
     def test_vicious_descriptor_nonsense(self):
         # Testing vicious_descriptor_nonsense...