Pull the 'keyword' property into Token.

pkg/analyzer/lib/src/generated/error_verifier.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 analyzer.src.generated.error_verifier;
 
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 2796 matching lines @@
    * See [StaticWarningCode.CONST_WITH_ABSTRACT_CLASS], and
    * [StaticWarningCode.NEW_WITH_ABSTRACT_CLASS].
    */
   void _checkForConstOrNewWithAbstractClass(
       InstanceCreationExpression expression,
       TypeName typeName,
       InterfaceType type) {
     if (type.element.isAbstract) {
       ConstructorElement element = expression.staticElement;
       if (element != null && !element.isFactory) {
-        if ((expression.keyword as KeywordToken).keyword == Keyword.CONST) {
+        if (expression.keyword.keyword == Keyword.CONST) {
           _errorReporter.reportErrorForNode(
               StaticWarningCode.CONST_WITH_ABSTRACT_CLASS, typeName);
         } else {
           _errorReporter.reportErrorForNode(
               StaticWarningCode.NEW_WITH_ABSTRACT_CLASS, typeName);
         }
       }
     }
   }
 
@@ skipping 3334 matching lines @@
 class _InvocationCollector extends RecursiveAstVisitor {
   final List<String> superCalls = <String>[];
 
   @override
   visitMethodInvocation(MethodInvocation node) {
     if (node.target is SuperExpression) {
       superCalls.add(node.methodName.name);
     }
   }
 }