diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testGCWhileRecording.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testGCWhileRecording.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+function test() {
+    for (let z = 0; z < 4; ++z) {
+      uneval({ x: 9 });
+      gc()
+    }
+    return "pass";
+}
+assertEq(test(), "pass");