Option support for `enableSuperMixins` (and more).

pkg/analyzer/lib/src/generated/error.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 engine.error;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/task/model.dart';
 import 'package:analyzer/task/model.dart';
@@ skipping 377 matching lines @@
           "The value '{1}' is not supported by {0}, legal values are {2}");
 
   /**
    * An error code indicating that an unrecognized error code is being used to
    * specify an error filter.
    *
    * Parameters:
    * 0: the unrecognized error code
    */
   static const AnalysisOptionsWarningCode UNRECOGNIZED_ERROR_CODE =
-      const AnalysisOptionsWarningCode('UNRECOGNIZED_ERROR_CODE',
-          "'{0}' is not a recognized error code");
+      const AnalysisOptionsWarningCode(
+          'UNRECOGNIZED_ERROR_CODE', "'{0}' is not a recognized error code");
 
   /**
    * Initialize a newly created warning code to have the given [name].
    */
   const AnalysisOptionsWarningCode(String name, String message,
       [String correction])
       : super(name, message, correction);
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.WARNING;
@@ skipping 5088 matching lines @@
    * Initialize a newly created error code to have the given [name].
    */
   const TodoCode(String name) : super(name, "{0}");
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.INFO;
 
   @override
   ErrorType get type => ErrorType.TODO;
 }