Scan generic method comments with Fasta.

pkg/front_end/lib/src/fasta/scanner/token.dart

 // Copyright (c) 2011, 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 fasta.scanner.token;
 
 import '../../scanner/token.dart' as analyzer;
 
 import 'keyword.dart' show Keyword;
 
@@ skipping 456 matching lines @@
    * Creates a lazy comment token. If [canonicalize] is true, the string
    * is canonicalized before the token is created.
    */
   CommentToken.fromSubstring(
       PrecedenceInfo info, String data, int start, int end, int charOffset,
       {bool canonicalize: false})
       : super.fromSubstring(info, data, start, end, charOffset,
             canonicalize: canonicalize);
 
   /**
+   * Creates a non-lazy comment token.
+   */
+  CommentToken.fromString(PrecedenceInfo info, String lexeme, int charOffset)
+      : super.fromString(info, lexeme, charOffset);
+
+  /**
    * Creates a lazy string token. If [asciiOnly] is false, the byte array
    * is passed through a UTF-8 decoder.
    */
   CommentToken.fromUtf8Bytes(PrecedenceInfo info, List<int> data, int start,
       int end, bool asciiOnly, int charOffset)
       : super.fromUtf8Bytes(info, data, start, end, asciiOnly, charOffset);
 
   CommentToken._(PrecedenceInfo info, valueOrLazySubstring, int charOffset)
       : super._(info, valueOrLazySubstring, charOffset);
 
@@ skipping 150 matching lines @@
       identical(value, "<=") ||
       identical(value, "<") ||
       identical(value, "&") ||
       identical(value, "^") ||
       identical(value, "|");
 }
 
 bool isTernaryOperator(String value) => identical(value, "[]=");
 
 bool isMinusOperator(String value) => identical(value, "-");