diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testThatGenExpsActuallyDecompile.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testThatGenExpsActuallyDecompile.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+// |jit-test| error: 3
+var str = (function (x) {return (i for (i in x));}).toSource().replace('\n', '');
+assertEq(str, "(function (x) {return (i for (i in x));})");
+throw 3;