Support for generic type variables and unresolved types added.

lib/compiler/implementation/dart_backend/renamer.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.
 
 /**
  * Renames only top-level elements that would let to ambiguity if not renamed.
  * TODO(smok): Make sure that top-level fields are correctly renamed.
  */
 class ConflictingRenamer {
   final Compiler compiler;
@@ skipping 17 matching lines @@
     return (placeholder !== null) ? placeholder.rename(this) : null;
   }
 
   String getName(LibraryElement library, String originalName, renamer) =>
       renamed.putIfAbsent(library, () => <String>{})
           .putIfAbsent(originalName, renamer);
 
   String renamePrivateIdentifier(LibraryElement library, String id) =>
       getName(library, id, () => '_${privateNameCounter++}${id}');
 
+  String generateUniqueName(name) {
+    while (usedTopLevelIdentifiers.contains(name)) name = 'p_$name';
+    usedTopLevelIdentifiers.add(name);
+    return name;
+  }
+
   String renameElement(Element element) {
     assert(element.isTopLevel());
     // TODO(smok): Make sure that the new name does not conflict with existing
     // local identifiers.
-    generateUniqueName(name) {
-      while (usedTopLevelIdentifiers.contains(name)) name = 'p_$name';
-      usedTopLevelIdentifiers.add(name);
-      return name;
-    }
-
     String originalName = element.name.slowToString();
     LibraryElement library = element.getLibrary();
     if (library === compiler.coreLibrary) return originalName;
     if (isDartCoreLib(compiler, library)) {
       final prefix =
           imports.putIfAbsent(library, () => generateUniqueName('p'));
       return '$prefix.$originalName';
     }
 
     return getName(library, originalName,
                    () => generateUniqueName(originalName));
   }
 }