Support rest element pattern with user-defined iterable

test/mjsunit/harmony/destructuring.js

Index: test/mjsunit/harmony/destructuring.js
diff --git a/test/mjsunit/harmony/destructuring.js b/test/mjsunit/harmony/destructuring.js
index 50f27857ec04ce302dacb2ab63139ac27167f61c..8a03143e0401367f96de87a887d288eeb4698c84 100644
--- a/test/mjsunit/harmony/destructuring.js
+++ b/test/mjsunit/harmony/destructuring.js
@@ -503,6 +503,28 @@
 }());
 
 
+(function TestRestCustomIterable() {
+    var idx = 0;
+    var iterable = {};
+    var iterator = {
+      next: function() {
+        idx += 1;
+        return {
+          value: idx,
+          done: idx === 4
+        };
+      }
+    };
+    iterable[Symbol.iterator] = function() {
+      return iterator;
+    };
+
+    var [...result] = iterable;
+
+    assertEquals([1, 2, 3], result);
+}());
+
+
 (function TestIteratorsLexical() {
   'use strict';
   var log = [];