diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-clear-iterators-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-clear-iterators-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+// A Map iterator does not visit entries removed by clear().
+
+load(libdir + "iteration.js");
+
+var m = Map();
+var it = m[std_iterator]();
+m.clear();
+assertIteratorDone(it, undefined);
+
+m = Map([["a", 1], ["b", 2], ["c", 3], ["d", 4]]);
+it = m[std_iterator]();
+assertIteratorNext(it, ["a", 1]);
+m.clear();
+assertIteratorDone(it, undefined);
+
+var log = "";
+m = Map([["a", 1], ["b", 2], ["c", 3], ["d", 4]]);
+for (var [k, v] of m) {
+    log += k + v;
+    if (k == "b")
+        m.clear();
+}
+assertEq(log, "a1b2");