diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parser/bug-844805-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parser/bug-844805-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// Constant folding does not affect strict delete.
+
+function f(x) {
+    "use strict";
+
+    // This senseless delete-expression is legal even in strict mode. Per ES5.1
+    // 11.4.1 step 2, it does nothing and returns true.
+    return delete (1 ? x : x);
+}
+assertEq(f(), true);