diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-iterator-add-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-iterator-add-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// A Set iterator does not iterate over new entries added after it throws StopIteration.
+
+load(libdir + "iteration.js");
+
+var set = Set();
+var iter0 = set[std_iterator](), iter1 = set[std_iterator]();
+assertIteratorDone(iter0, undefined);  // closes iter0
+set.add("x");
+assertIteratorDone(iter0, undefined);  // already closed
+assertIteratorNext(iter1, "x");  // was not yet closed