diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/decompiler.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/decompiler.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+// The decompiler correctly handles for-of loops.
+
+function tokens(code) {
+    var arr = [];
+    var s = code.replace(/\w+|[^\s]/g, function (tok) { arr.push(tok); return ""; });
+    assertEq(s.trim(), "", "tokens() should find all tokens in code: " + uneval(code));
+    return arr;
+}
+
+function test(code) {
+    var before = "function f() { " + code + " }";
+    var after = eval("(" + before + ")").toString();
+    assertEq(tokens(before).join(" "), tokens(after).join(" "), "decompiler failed to round-trip");
+}
+
+// statements
+test("for (a of b) { f(a); }");
+test("for (a of b) { f(a); g(a); }");
+
+// for-of with "in" operator nearby
+test("for (a of b in c ? c : c.items()) { f(a); }");
+
+// destructuring
+test("for ([a, b] of c) { a.m(b); }");
+
+// for-let-of
+test("for (let a of b) { f(a); }");
+test("for (let [a, b] of c) { a.m(b); }");
+
+// array comprehensions
+test("return [a for (a of b)];");
+test("return [[b, a] for ([a, b] of c.items())];");
+
+// generator expressions
+test("return (a for (a of b));");
+