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

corelib/src/exceptions.dart

 // Copyright (c) 2012, 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.
 
 // Exceptions are thrown either by the VM or from Dart code.
 
 /**
  * Interface implemented by all core library exceptions.
  */
 interface Exception default ExceptionImplementation {
@@ skipping 31 matching lines @@
 
   String toString() {
     StringBuffer sb = new StringBuffer();
     for (int i = 0; i < _arguments.length; i++) {
       if (i > 0) {
         sb.add(", ");
       }
       sb.add(_arguments[i]);
     }
     if (_existingArgumentNames === null) {
-      return "NoSuchMethodException : method not found: '$_functionName'\n" +
-          "Receiver: $_receiver\n" + "Arguments: [$sb]";
+      return "NoSuchMethodException : method not found: '$_functionName'\n"
+          "Receiver: $_receiver\n"
+          "Arguments: [$sb]";
     } else {
       String actualParameters = sb.toString();
       sb = new StringBuffer();
       for (int i = 0; i < _existingArgumentNames.length; i++) {
         if (i > 0) {
           sb.add(", ");
         }
         sb.add(_existingArgumentNames[i]);
       }
       String formalParameters = sb.toString();
-      return "NoSuchMethodException: incorrect number of arguments passed to " +
-          "method named '$_functionName'\nReceiver: $_receiver\n" +
-          "Tried calling: $_functionName($actualParameters)\n" +
+      return "NoSuchMethodException: incorrect number of arguments passed to "
+          "method named '$_functionName'\nReceiver: $_receiver\n"
+          "Tried calling: $_functionName($actualParameters)\n"
           "Found: $_functionName($formalParameters)";
     }
   }
 
   final Object _receiver;
   final String _functionName;
   final List _arguments;
   final List _existingArgumentNames;
 }
 
@@ skipping 78 matching lines @@
   String toString() => "IllegalJSRegExpException: '$_pattern' '$_errmsg'";
   final String _pattern;
   final String _errmsg;
 }
 
 
 class IntegerDivisionByZeroException implements Exception {
   const IntegerDivisionByZeroException();
   String toString() => "IntegerDivisionByZeroException";
 }