anchor.diff:  // Copyright (c) 2016, 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.
  -
  -import 'package:analyzer/error/error.dart'
  -    show errorCodeValues, errorCodeByUniqueName;
   
   /**
    * An error code associated with an [AnalysisError].
  
positive.code: 
    @override
    String toString() => uniqueName;
  
    /**
     * Return the [ErrorCode] with the given [uniqueName], or `null` if not
     * found.
     */
    @deprecated
    static ErrorCode byUniqueName(String uniqueName) =>
        errorCodeByUniqueName(uniqueName);
  }
  
  /**
  
negative.code:  */
  abstract class ErrorCode {
    /**
     * The name of the error code.
     */
    final String name;
  