fix #25739, incorrectly expanding a generic comment multiple times

pkg/analyzer/lib/src/generated/parser.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.parser;
 
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 3933 matching lines @@
   }
 
   bool _injectGenericComment(TokenType type, int prefixLen) {
     if (parseGenericMethodComments) {
       CommentToken t = _currentToken.precedingComments;
       for (; t != null; t = t.next) {
         if (t.type == type) {
           String comment = t.lexeme.substring(prefixLen, t.lexeme.length - 2);
           Token list = _scanGenericMethodComment(comment, t.offset + prefixLen);
           if (list != null) {
+            // Remove the tokens from the comment stream.

[Bob Nystrom, 2016/02/18 16:58:58]

Nit: "tokens" -> "token".

The overall effect of the outer loop is to remove them all, but the line here
just removes the one.

+            t.remove();
             // Insert the tokens into the stream.
             _injectTokenList(list);
             return true;
           }
         }
       }
     }
     return false;
   }
 
@@ skipping 7388 matching lines @@
   }
 
   /**
    * Copy resolution data from the [fromNode] to the [toNode].
    */
   static void copyResolutionData(AstNode fromNode, AstNode toNode) {
     ResolutionCopier copier = new ResolutionCopier();
     copier._isEqualNodes(fromNode, toNode);
   }
 }