diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug654668.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug654668.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+var summary = 'foo';
+function X(n) {
+    var y = [];
+    while (summary + y[0]) {
+        break;
+    }
+}
+X();
+
+// Don't crash wthi -m -n -a