Miscellaneous runtime fixes.

tool/input_sdk/private/ddc_runtime/utils.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 part of dart._runtime;
 
 /// This library defines a set of general javascript utilities for us
 /// by the Dart runtime.
 // TODO(ochafik): Rewrite some of these in Dart when possible.
 
 defineProperty(obj, name, desc) =>
@@ skipping 75 matching lines @@
   for (let name of $getOwnNamesAndSymbols($from)) {
     $defineLazyProperty($to, name, $getOwnPropertyDescriptor($from, name));
   }
 })()''');
 
 defineMemoizedGetter(obj, String name, getter) {
   return defineLazyProperty(obj, name, JS('', '{get: #}', getter));
 }
 
 copyTheseProperties(to, from, names) => JS('', '''(() => {
-  for (let name of $names) {
-    $copyProperty($to, $from, name);
+  for (var i = 0; i < $names.length; ++i) {

[Jennifer Messerly, 2016/05/11 19:56:26]

nit: use `let`

[Leaf, 2016/05/12 17:00:44]

Done.

+    $copyProperty($to, $from, $names[i]);
   }
   return $to;
 })()''');
 
 copyProperty(to, from, name) {
   var desc = getOwnPropertyDescriptor(from, name);
   if (JS('bool', '# == Symbol.iterator', name)) {
     // On native types, Symbol.iterator may already be present.
     // TODO(jmesserly): investigate if we still need this.
     // If so, we need to find a better solution.
@@ skipping 10 matching lines @@
 }
 
 @JSExportName('export')
 exportProperty(to, from, name) => copyProperty(to, from, name);
 
 /// Copy properties from source to destination object.
 /// This operation is commonly called `mixin` in JS.
 copyProperties(to, from) {
   return copyTheseProperties(to, from, getOwnNamesAndSymbols(from));
 }