1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/for-of/iterator-next-reference.js b/js/src/tests/test262/language/statements/for-of/iterator-next-reference.js
new file mode 100644
index 0000000000..29b9cc4080
--- /dev/null
+++ b/js/src/tests/test262/language/statements/for-of/iterator-next-reference.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-getiterator
+description: >
+    The iterator's `next` method should be accessed only once with each
+    iteration as per the `GetIterator` abstract operation (7.4.1).
+features: [Symbol.iterator, for-of]
+---*/
+
+var iterable = {};
+var iterator = {};
+var iterationCount = 0;
+var loadNextCount = 0;
+
+iterable[Symbol.iterator] = function() {
+  return iterator;
+};
+
+function next() {
+  if (iterationCount) return { done: true };
+  return { value: 45, done: false };
+}
+Object.defineProperty(iterator, 'next', {
+  get() { loadNextCount++; return next; },
+  configurable: true
+});
+
+for (var x of iterable) {
+  assert.sameValue(x, 45);
+
+  Object.defineProperty(iterator, 'next', {
+    get: function() {
+      throw new Test262Error(
+          'Should not access the `next` method after the iteration prologue.');
+    }
+  });
+  iterationCount++;
+}
+assert.sameValue(iterationCount, 1);
+assert.sameValue(loadNextCount, 1);
+
+reportCompare(0, 0);