diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug778603.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug778603.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,1 @@
+assertEq(unescape("0%u0000".substr(0,2)), "0%");