fasta.CommentToken implement analyzer.CommentToken

pkg/front_end/test/scanner_fasta_test.dart

 // Copyright (c) 2017, 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/src/fasta/token_utils.dart';
 import 'package:front_end/src/fasta/scanner/error_token.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/keyword.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/string_scanner.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/token.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/token_constants.dart' as fasta;
@@ skipping 84 matching lines @@
     expect(tokenCount, 26);
 
     tokenCount = 0;
     int previousEnd = 0;
     int spotCheckCount = 0;
     int commentTokenCount = 0;
     token = scanSource(includeComments: true);
     while (!token.isEof) {
       ++tokenCount;
       // Assert valid comments
-      fasta.Token comment = token.precedingComments;
+      fasta.CommentToken comment = token.precedingComments;
       while (comment != null) {
         ++commentTokenCount;
         expect(comment.info.kind, fasta.COMMENT_TOKEN);
         expect(comment.charOffset, greaterThanOrEqualTo(previousEnd));
         previousEnd = comment.charOffset + comment.charCount;
         comment = comment.next;
       }
       expect(token.info.kind, isNot(fasta.COMMENT_TOKEN));
       expect(token.charOffset, greaterThanOrEqualTo(previousEnd));
       previousEnd = token.charOffset + token.charCount;
@@ skipping 54 matching lines @@
     // Figure out which recovery technique we want the front end to use.
     super.test_mismatched_opener();
   }
 
   void test_next_previous() {
     const source = 'int a; /*1*/ /*2*/ /*3*/ B f(){if (a < 2) {}}';
     fasta.Token token =
         new fasta.StringScanner(source, includeComments: true).tokenize();
     while (!token.isEof) {
       expect(token.next.previousToken, token);
-      fasta.Token commentToken = token.precedingComments;
+      fasta.CommentToken commentToken = token.precedingComments;
       while (commentToken != null) {
         if (commentToken.next != null) {
           expect(commentToken.next.previousToken, commentToken);
         }
         commentToken = commentToken.next;
       }
       token = token.next;
     }
   }
 
@@ skipping 268 matching lines @@
   final ErrorListener _listener;
 
   ToAnalyzerTokenStreamConverter_WithListener(this._listener);
 
   @override
   void reportError(
       ScannerErrorCode errorCode, int offset, List<Object> arguments) {
     _listener.errors.add(new TestError(offset, errorCode, arguments));
   }
 }