1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/for-of/semantics-03.js b/js/src/jit-test/tests/for-of/semantics-03.js
new file mode 100644
index 0000000000..069b7fa749
--- /dev/null
+++ b/js/src/jit-test/tests/for-of/semantics-03.js
@@ -0,0 +1,13 @@
+// Replacing Array.prototype.iterator with a generator affects for-of behavior.
+
+load(libdir + "iteration.js");
+
+Array.prototype[Symbol.iterator] = function* () {
+    for (var i = this.length; --i >= 0; )
+        yield this[i];
+};
+
+var s = '';
+for (var v of ['a', 'b', 'c', 'd'])
+    s += v;
+assertEq(s, 'dcba');