diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-constructor-generator-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-constructor-generator-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// The argument to Set can be a generator.
+
+function hexData(n) {
+    for (var i = 0; i < n; i++)
+        yield i.toString(16);
+}
+
+var s = Set(hexData(256));
+assertEq(s.size, 256);
+assertEq(s.has("0"), true);
+assertEq(s.has(0), false);
+assertEq(s.has("ff"), true);