diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/syntax-4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/syntax-4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+// The right-hand-side of a for-of is an assignment expression.
+
+load(libdir + 'asserts.js');
+
+function assertSyntaxError(str) {
+  assertThrowsInstanceOf(function () { return Function(str); }, SyntaxError);
+}
+
+assertSyntaxError("for (var x     of 1, 2) {}");
+assertSyntaxError("for (var [x]   of 1, 2) {}");
+assertSyntaxError("for (var {x}   of 1, 2) {}");
+
+assertSyntaxError("for (let x     of 1, 2) {}");
+assertSyntaxError("for (let [x]   of 1, 2) {}");
+assertSyntaxError("for (let {x}   of 1, 2) {}");
+
+assertSyntaxError("for (const x   of 1, 2) {}");
+assertSyntaxError("for (const [x] of 1, 2) {}");
+assertSyntaxError("for (const {x} of 1, 2) {}");