diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-iterator-remove-3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-iterator-remove-3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// A set iterator can cope with removing the next entry, then the current entry.
+
+load(libdir + "iteration.js");
+
+var set = Set("abcd");
+var iter = set[std_iterator]();
+assertIteratorNext(iter, "a");
+assertIteratorNext(iter, "b");
+set.delete("c");
+set.delete("b");
+assertIteratorNext(iter, "d");
+assertIteratorDone(iter, undefined);