diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-constructor-generator-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-constructor-generator-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+// The argument to Set can be a generator-expression.
+
+var s = Set(k * k for (k of [1, 2, 3, 4]));
+assertEq(s.size, 4);
+assertEq(s.has(1), true);
+assertEq(s.has(4), true);
+assertEq(s.has(9), true);
+assertEq(s.has(16), true);