incremental improvement to top level code completion results

pkg/analysis_services/lib/completion/completion_suggestion.dart

 // Copyright (c) 2014, 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.
 
 library services.completion.suggestion;
 
 import 'package:analysis_services/constants.dart';
 import 'package:analysis_services/json.dart';
 import 'package:analyzer/src/generated/element.dart';
 
 /**
  * An enumeration of the relevance of a completion suggestion.
  */
 class CompletionRelevance {
   static const CompletionRelevance LOW = const CompletionRelevance('LOW');
   static const CompletionRelevance DEFAULT =
       const CompletionRelevance('DEFAULT');
   static const CompletionRelevance HIGH = const CompletionRelevance('HIGH');
 
   final String name;
 
   const CompletionRelevance(this.name);
 
   static CompletionRelevance value(String name) {
     if (LOW.name == name) return LOW;
     if (DEFAULT.name == name) return DEFAULT;
     if (HIGH.name == name) return HIGH;
     throw new ArgumentError('Unknown CompletionRelevance: $name');
   }
+
+  toString() => 'CompletionRelevance.$name';
 }
 
 /**
  * A single completion suggestion.
  */
 class CompletionSuggestion implements HasToJson {
 
   /**
    *  The kind of element being suggested.
    */
@@ skipping 185 matching lines @@
     if (NAMED_ARGUMENT.name == name) return NAMED_ARGUMENT;
     if (OPTIONAL_ARGUMENT.name == name) return OPTIONAL_ARGUMENT;
     if (PARAMETER.name == name) return PARAMETER;
     if (SETTER.name == name) return SETTER;
     if (TOP_LEVEL_VARIABLE.name == name) return TOP_LEVEL_VARIABLE;
     if (TYPE_PARAMETER.name == name) return TYPE_PARAMETER;
     if (VARIABLE.name == name) return VARIABLE;
     throw new ArgumentError('Unknown CompletionSuggestionKind: $name');
   }
 }