Generated source mapping through CPS.

pkg/compiler/lib/src/io/start_end_information.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.
 
 /// Source information system that maps spans of Dart AST nodes to spans of
 /// JavaScript nodes.
 
 library dart2js.source_information.start_end;
 
 import '../dart2jslib.dart' show
@@ skipping 185 matching lines @@
         sourceFileLocationForToken(node.getEndToken()));
   }
 
   @override
   SourceInformation buildGeneric(Node node) {
     return new StartEndSourceInformation(
         sourceFileLocationForToken(node.getBeginToken()));
   }
 
   @override
-  SourceInformation buildReturn(Node node) {
-    return buildGeneric(node);
-  }
+  SourceInformation buildCreate(Node node) => buildGeneric(node);
+
+  @override
+  SourceInformation buildReturn(Node node) => buildGeneric(node);
 
   @override
   SourceInformation buildGet(Node node) => buildGeneric(node);
 
   @override
   SourceInformation buildAssignment(Node node) => buildGeneric(node);
 
   @override
   SourceInformation buildCall(Node receiver, Node call) {
     return buildGeneric(receiver);
   }
 
   @override
   SourceInformation buildIf(Node node) => buildGeneric(node);
 
   @override
   SourceInformationBuilder forContext(
       AstElement element, {SourceInformation sourceInformation}) {
     return new StartEndSourceInformationBuilder(element);
   }
 }