Quick Fix for returning Future from 'async' functions.

pkg/analysis_server/lib/src/services/correction/fix.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.correction.fix;
 
 import 'package:analysis_server/src/protocol.dart' show SourceChange;
 import 'package:analysis_server/src/services/correction/fix_internal.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/error.dart';
@@ skipping 84 matching lines @@
   static const REMOVE_UNNECASSARY_CAST =
       const FixKind('REMOVE_UNNECASSARY_CAST', 50, "Remove unnecessary cast");
   static const REMOVE_UNUSED_IMPORT =
       const FixKind('REMOVE_UNUSED_IMPORT', 50, "Remove unused import");
   static const REPLACE_BOOLEAN_WITH_BOOL = const FixKind(
       'REPLACE_BOOLEAN_WITH_BOOL', 50, "Replace 'boolean' with 'bool'");
   static const REPLACE_IMPORT_URI =
       const FixKind('REPLACE_IMPORT_URI', 50, "Replace with '{0}'");
   static const REPLACE_VAR_WITH_DYNAMIC = const FixKind(
       'REPLACE_VAR_WITH_DYNAMIC', 50, "Replace 'var' with 'dynamic'");
+  static const REPLACE_RETURN_TYPE_FUTURE = const FixKind(
+      'REPLACE_RETURN_TYPE_FUTURE', 50,
+      "Return 'Future' from 'async' function");
   static const USE_CONST = const FixKind('USE_CONST', 50, "Change to constant");
   static const USE_EFFECTIVE_INTEGER_DIVISION = const FixKind(
       'USE_EFFECTIVE_INTEGER_DIVISION', 50,
       "Use effective integer division ~/");
   static const USE_EQ_EQ_NULL =
       const FixKind('USE_EQ_EQ_NULL', 50, "Use == null instead of 'is Null'");
   static const USE_NOT_EQ_NULL =
       const FixKind('USE_NOT_EQ_NULL', 50, "Use != null instead of 'is! Null'");
 
   final name;
   final int relevance;
   final String message;
 
   const FixKind(this.name, this.relevance, this.message);
 
   @override
   String toString() => name;
 }