diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_5/regress/regress-559438.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_5/regress/regress-559438.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor: Jason Orendorff
+ */
+
+function f(x) { return 1 + "" + (x + 1); }
+reportCompare("12", f(1), "");
+var g = eval("(" + f + ")");
+reportCompare("12", g(1), "");