Version 0.3.7.4

dart/sdk/lib/_internal/compiler/implementation/lib/js_helper.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.
 
 library _js_helper;
 
 import 'dart:collection';
 import 'dart:_foreign_helper' show DART_CLOSURE_TO_JS,
                                    JS,
                                    JS_CALL_IN_ISOLATE,
@@ skipping 329 matching lines @@
 
   static String stringFromCharCodes(charCodes) {
     for (var i in charCodes) {
       if (i is !int) throw new ArgumentError(i);
       if (i < 0) throw new ArgumentError(i);
       if (i > 0xffff) return stringFromCodePoints(charCodes);
     }
     return _fromCharCodeApply(charCodes);
   }
 
+  static String stringConcatUnchecked(String string1, String string2) {
+    return JS('String', r'# + #', string1, string2);
+  }
+
   static String getTimeZoneName(receiver) {
     // When calling toString on a Date it will emit the timezone in parenthesis.
     // Example: "Wed May 16 2012 21:13:00 GMT+0200 (CEST)".
     // We extract this name using a regexp.
     var d = lazyAsJsDate(receiver);
     return JS('String', r'/\((.*)\)/.exec(#.toString())[1]', d);
   }
 
   static int getTimeZoneOffsetInMinutes(receiver) {
     // Note that JS and Dart disagree on the sign of the offset.
@@ skipping 1194 matching lines @@
   var substitution;
   if (JS('bool', '# !== #', typeOfT, typeOfS)) {
     var field = '${JS_OPERATOR_AS_PREFIX()}${runtimeTypeToString(typeOfT)}';
     substitution = getField(typeOfS, field);
   }
   // Recursively check the type arguments.
   return checkArguments(substitution, getArguments(s), getArguments(t));
 }
 
 createRuntimeType(String name) => new TypeImpl(name);