diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testConstSwitch.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testConstSwitch.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// No test case, just make sure this doesn't assert.
+function testNegZero2() {
+    var z = 0;
+    for (let j = 0; j < 5; ++j) { ({p: (-z)}); }
+}
+testNegZero2();
+
+function testConstSwitch() {
+    var x;
+    for (var j=0;j<5;++j) { switch(1.1) { case NaN: case 2: } x = 2; }
+    return x;
+}
+assertEq(testConstSwitch(), 2);