diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testFoldPropertyAccess.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testFoldPropertyAccess.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+
+var cases = [
+    function (obj) {
+        return obj["ab"];
+    },
+    function (obj) {
+        return obj["a" + "b"];
+    },
+    function (obj) {
+        return obj[0 ? "cd" : "ab"];
+    },
+    function (obj) {
+        return obj[true ? "ab" : "cd"];
+    },
+    function (obj) {
+        return obj[(1 + 0) ? "ab" : "cd"];
+    }
+]
+
+for (var i = 0; i < cases.length; i++) {
+    assertEq(cases[i]({ab: 42}), 42);
+    assertEq(cases[i]({cd: 120}), undefined);
+}