diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-iterator-remove-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-iterator-remove-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// A map iterator can cope with removing the next entry.
+
+load(libdir + "iteration.js");
+
+var set = Set("abcd");
+var iter = set[std_iterator]();
+var log = "";
+for (let x of iter) {
+    log += x;
+    if (x === "b")
+        set.delete("c");
+}
+assertEq(log, "abd");