- Fix use of String operator + in runtime and standalone libraries.

corelib/src/future.dart

 // Copyright (c) 2011, 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.
 
 // Dart core library.
 
 
 /**
  * A [Future] is used to obtain a value sometime in the future.  Receivers of a
  * [Future] obtain the value by passing a callback to [then]. For example:
  *
  *   Future<int> future = getFutureFromSomewhere();
  *   future.then((value) {
- *     print("I received the number " + value);
+ *     print("I received the number $value");
  *   });
  */
 interface Future<T> default FutureImpl<T> {
 
   /** A future whose value is immediately available. */
   Future.immediate(T value);
 
   /** The value provided. Throws an exception if [hasValue] is false. */
   T get value();
 
@@ skipping 158 matching lines @@
 
     // Special case where all the futures are already completed,
     // trigger the value now.
     if (futures.length == 0) {
       completer.complete(values);
     }
 
     return completer.future;
   }
 }