When importing a library without a prefix, add the elements from the element map instead of the lis…

frog/leg/scanner/scanner_task.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.
 
 class ScannerTask extends CompilerTask {
   ScannerTask(Compiler compiler) : super(compiler);
   String get name() => 'Scanner';
 
   void scan(CompilationUnitElement compilationUnit) {
     measure(() {
@@ skipping 87 matching lines @@
       compiler.withCurrentElement(library, () => scan(library));
     }
     return library;
   }
 
   void importLibrary(LibraryElement library, LibraryElement imported,
                      LiteralString prefix) {
     if (prefix !== null) {
       library.define(new PrefixElement(prefix, imported, library), compiler);
     } else {
-      for (Link<Element> link = imported.topLevelElements; !link.isEmpty();
-           link = link.tail) {
-        compiler.withCurrentElement(link.head, () {
-            library.define(link.head, compiler);
-          });
-      }
+      imported.forEachExport((Element element) {
+        compiler.withCurrentElement(element, () {
+          library.define(element, compiler);
+        });
+      });
     }
   }
 }
 
 class DietParserTask extends CompilerTask {
   DietParserTask(Compiler compiler) : super(compiler);
   final String name = 'Diet Parser';
 
   dietParse(CompilationUnitElement compilationUnit, Token tokens) {
     measure(() {
       ElementListener listener = new ElementListener(compiler, compilationUnit);
       PartialParser parser = new PartialParser(listener);
       parser.parseUnit(tokens);
     });
   }
 }