diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-iterator-remove-3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-iterator-remove-3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// A map iterator can cope with removing the next entry, then the current entry.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+var map = Map([['a', 0], ['b', 1], ['c', 2], ['d', 3]]);
+var iter = map[std_iterator]();
+assertIteratorNext(iter, ['a', 0]);
+assertIteratorNext(iter, ['b', 1]);
+map.delete('c');
+map.delete('b');
+assertIteratorNext(iter, ['d', 3]);
+assertIteratorDone(iter, undefined);