Array.prototype.reverse should call [[HasProperty]] on elements before [[Get]]

test/mjsunit/es6/array-reverse-order.js

Index: test/mjsunit/es6/array-reverse-order.js
diff --git a/test/mjsunit/es6/array-reverse-order.js b/test/mjsunit/es6/array-reverse-order.js
new file mode 100644
index 0000000000000000000000000000000000000000..590491cb68ce6202dae8fc76080b0ab38846dcae
--- /dev/null
+++ b/test/mjsunit/es6/array-reverse-order.js
@@ -0,0 +1,10 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// ES6 specifically says that elements should be checked with [[HasElement]] before
+// [[Get]]. This is observable in case a getter deletes elements. ES5 put the
+// [[HasElement]] after the [[Get]].
+
+assertTrue(1 in Array.prototype.reverse.call(
+    {length:2, get 0(){delete this[0];}, 1: "b"}))

[adamk, 2015/07/16 22:08:13]

Can you spread this out over multiple statements to make it a bit more readable?
I.e., assign the object to a variable, assign the result of reverse.

Also, "order" in the name of this test doesn't help me much. I'd just drop it
from the name, leaving this as es6/array-reverse.js