diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testSwitchString.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testSwitchString.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,28 @@
+function testSwitchString() {
+    var x = "asdf";
+    var ret = 0;
+    for (var i = 0; i < 100; ++i) {
+        switch (x) {
+        case "asdf":
+            x = "asd";
+            ret += 1;
+            break;
+        case "asd":
+            x = "as";
+            ret += 2;
+            break;
+        case "as":
+            x = "a";
+            ret += 3;
+            break;
+        case "a":
+            x = "foo";
+            ret += 4;
+            break;
+        default:
+            x = "asdf";
+        }
+    }
+    return ret;
+}
+assertEq(testSwitchString(), 200);