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

compiler/java/com/google/dart/compiler/ast/LibraryExport.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.Sets;
+import com.google.dart.compiler.common.SourceInfo;
 
 import java.util.List;
 import java.util.Set;
 
 /**
  * Information about export - {@link LibraryUnit} and show/hide names.
  */
 public class LibraryExport {
+  private final SourceInfo sourceInfo;
   private final LibraryUnit library;
   private final Set<String> showNames;
   private final Set<String> hideNames;
 
-  public LibraryExport(LibraryUnit library, List<ImportCombinator> combinators) {
+  public LibraryExport(SourceInfo sourceInfo, LibraryUnit library,
+      List<ImportCombinator> combinators) {
+    this.sourceInfo = sourceInfo;
     this.library = library;
     this.showNames = createCombinatorsSet(combinators, true);
     this.hideNames = createCombinatorsSet(combinators, false);
   }
 
+  public SourceInfo getSourceInfo() {
+    return sourceInfo;
+  }
+
   public LibraryUnit getLibrary() {
     return library;
   }
 
   public boolean isVisible(String name) {
     if (hideNames.contains(name)) {
       return false;
     }
     if (!showNames.isEmpty()) {
       return showNames.contains(name);
@@ skipping 19 matching lines @@
         for (DartIdentifier hideName : hideCombinator.getHiddenNames()) {
           if (hideName != null) {
             result.add(hideName.getName());
           }
         }
       }
     }
     return result;
   }
 }