diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug570663-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug570663-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+// don't crash
+for (var a = 0; a < 4; a++) {
+  switch (NaN) {}
+}