Send 'server.error' notification in case of an exception during performing an operation.

pkg/analysis_server/lib/src/protocol.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 protocol;
 
 import 'dart:collection';
 import 'dart:convert' show JsonDecoder;
 
 import 'package:analysis_services/json.dart';
@@ skipping 882 matching lines @@
    */
   void setParameter(String name, Object value) {
     params[name] = _toJson(value);
   }
 
   /**
    * Return a table representing the structure of the Json object that will be
    * sent to the client to represent this response.
    */
   Map<String, Object> toJson() {
-    Map<String, Object> jsonObject = new HashMap<String, Object>();
+    Map<String, Object> jsonObject = {};
     jsonObject[EVENT] = event;
     if (!params.isEmpty) {
       jsonObject[PARAMS] = params;
     }
     return jsonObject;
   }
 }
 
 /**
  * Instances of the class [RequestHandler] implement a handler that can handle
@@ skipping 31 matching lines @@
  */
 _toJson(Object value) {
   if (value is HasToJson) {
     return value.toJson();
   }
   if (value is Iterable) {
     return value.map((item) => _toJson(item)).toList();
   }
   return value;
 }