diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug570663-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug570663-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function f() {
+    var x;
+    for (var a = 0; a < 4; a++) {
+	switch (NaN) {
+	default:
+	    x = a;
+	}
+    }
+    assertEq(x, 3);
+}
+
+f();