Issue 6824. Re-export of conflicting elements is error.

compiler/java/com/google/dart/compiler/ast/LibraryNode.java

 // 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.
 
 package com.google.dart.compiler.ast;
 
 import com.google.common.collect.ImmutableList;
 import com.google.dart.compiler.common.AbstractNode;
 
 import java.util.List;
@@ skipping 15 matching lines @@
    * @param text the text comprising the node (not <code>null</code>)
    */
   public LibraryNode(String text) {
     this.text = text;
     this.prefix = null;
     this.combinators = ImmutableList.<ImportCombinator>of();
     this.exported = false;
   }
 
   public LibraryNode(DartImportDirective importDirective) {
+    setSourceInfo(importDirective.getSourceInfo());
     this.text = importDirective.getLibraryUri().getValue();
     this.prefix = importDirective.getPrefixValue();
     this.combinators = importDirective.getCombinators();
     this.exported = importDirective.isExported();
   }
 
   public LibraryNode(DartExportDirective exportDirective) {
+    setSourceInfo(exportDirective.getSourceInfo());
     this.text = exportDirective.getLibraryUri().getValue();
     this.prefix = null;
     this.combinators = exportDirective.getCombinators();
     this.exported = false;
   }
-
+  
   public String getText() {
     return text;
   }
 
   public String getPrefix() {
     return prefix;
   }
   
   public List<ImportCombinator> getCombinators() {
     return combinators;
   }
   
   public boolean isExported() {
     return exported;
   }
 }