Fix another parser bug

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 524 matching lines @@
     // We know that we have an identifier, and need to see whether it might be
     // a type name.
     if (_currentToken.type != TokenType.IDENTIFIER) {
       allowAdditionalTokens = false;
     }
     Token token = skipTypeName(_currentToken);
     if (token == null) {
       // There was no type name, so this can't be a declaration.
       return false;
     }
-    if (_tokenMatchesKeyword(token, Keyword.FUNCTION)) {
+    if (_atGenericFunctionTypeAfterReturnType(token)) {
       token = skipGenericFunctionTypeAfterReturnType(token);
+      if (token == null) {
+        // There was no type name, so this can't be a declaration.
+        return false;
+      }
     }
     if (token.type != TokenType.IDENTIFIER) {
       allowAdditionalTokens = false;
     }
     token = skipSimpleIdentifier(token);
     if (token == null) {
       return false;
     }
     TokenType type = token.type;
     // Usual cases in valid code:
@@ skipping 8001 matching lines @@
     }
     if (modifiers.finalKeyword != null) {
       _reportErrorForToken(
           ParserErrorCode.FINAL_TYPEDEF, modifiers.finalKeyword);
     }
     if (modifiers.varKeyword != null) {
       _reportErrorForToken(ParserErrorCode.VAR_TYPEDEF, modifiers.varKeyword);
     }
   }
 }