diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug866611.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug866611.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,5 @@
+// |jit-test| error: InternalError
+y = 'x'
+for (var i=0; i<100; i++)
+    y += y;
+print(y.length);