Fix exception parsing generic function type syntax

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 5635 matching lines @@
    * creating a type annotation or changing the current token. Return the token
    * following the type annotation that was parsed, or `null` if the given token
    * is not the first token in a valid type annotation.
    *
    * This method must be kept in sync with [parseTypeAnnotation].
    */
   Token skipTypeAnnotation(Token startToken) {
     Token next = null;
     if (_atGenericFunctionTypeAfterReturnType(startToken)) {
       next = skipGenericFunctionTypeAfterReturnType(startToken);
-    } else if (_currentToken.keyword == Keyword.VOID &&
-        _atGenericFunctionTypeAfterReturnType(_currentToken.next)) {
-      next = next.next;
+    } else if (startToken.keyword == Keyword.VOID &&
+        _atGenericFunctionTypeAfterReturnType(startToken.next)) {
+      next = startToken.next;
     } else {
       next = skipTypeName(startToken);
     }
     while (next != null && _atGenericFunctionTypeAfterReturnType(next)) {
       next = skipGenericFunctionTypeAfterReturnType(next);
     }
     return next;
   }
 
   /**
@@ skipping 2931 matching lines @@
     }
   }
 }
 
 /**
  * Instances of this class are thrown when the parser detects that AST has
  * too many nested expressions to be parsed safely and avoid possibility of
  * [StackOverflowError] in the parser or during later analysis.
  */
 class _TooDeepTreeError {}