improve parser recovery of type argument list

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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.parser;
 
 import "dart:math" as math;
@@ skipping 7956 matching lines @@
    *     typeList ::=
    *         type (',' type)*
    */
   Token _skipTypeArgumentList(Token startToken) {
     Token token = startToken;
     if (!_tokenMatches(token, TokenType.LT)) {
       return null;
     }
     token = _skipTypeName(token.next);
     if (token == null) {
+      // If the start token '<' is followed by '>'
+      // then assume this should be type argument list but is missing a type
+      token = startToken.next;
+      if (_tokenMatches(token, TokenType.GT)) {
+        return token.next;
+      }
       return null;
     }
     while (_tokenMatches(token, TokenType.COMMA)) {
       token = _skipTypeName(token.next);
       if (token == null) {
         return null;
       }
     }
     if (token.type == TokenType.GT) {
       return token.next;
@@ skipping 2544 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);
   }
 }