[parser] Disallow Expression in for..of statements

test/mjsunit/for-in.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 113 matching lines @@
   var large_key = 2147483650;
   var o = {__proto__: {}};
   o[large_key] = 1;
   o.__proto__[large_key] = 1;
   var keys = [];
   for (var k in o) {
     keys.push(k);
   }
   assertEquals(["2147483650"], keys);
 })();
+
+(function() {
+  var iterCount = 0;
+  var key;
+
+  for (key in { badKey: 0 }, { goodKey: 0 }) {
+    assertEquals('goodKey', key);
+    iterCount += 1;
+  }
+
+  assertEquals(1, iterCount);
+})();