Fix for issue 18244

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 7276 matching lines @@
    *          declaration
    * @param externalKeyword the 'external' token
    * @param staticKeyword the static keyword, or `null` if the getter is not static
    * @param returnType the return type of the method
    * @return the method declaration that was parsed
    */
   MethodDeclaration
       _parseMethodDeclarationAfterReturnType(CommentAndMetadata commentAndMetadata,
       Token externalKeyword, Token staticKeyword, TypeName returnType) {
     SimpleIdentifier methodName = parseSimpleIdentifier();
-    FormalParameterList parameters = parseFormalParameterList();
+    FormalParameterList parameters;
+    if (!_matches(TokenType.OPEN_PAREN) &&
+        (_matches(TokenType.OPEN_CURLY_BRACKET) || _matches(TokenType.FUNCTION))) {
+      _reportErrorForToken(ParserErrorCode.MISSING_METHOD_PARAMETERS, _currentToken.previous);
+      parameters = new FormalParameterList(
+          _createSyntheticToken(TokenType.OPEN_PAREN),
+                null,
+                null,
+                null,
+                _createSyntheticToken(TokenType.CLOSE_PAREN));
+    } else {
+      parameters = parseFormalParameterList();
+    }
     _validateFormalParameterList(parameters);
     return _parseMethodDeclarationAfterParameters(
         commentAndMetadata,
         externalKeyword,
         staticKeyword,
         returnType,
         methodName,
         parameters);
   }
 
@@ skipping 3087 matching lines @@
 
   static const ParserErrorCode MISSING_FUNCTION_BODY = const ParserErrorCode(
       'MISSING_FUNCTION_BODY',
       "A function body must be provided");
 
   static const ParserErrorCode MISSING_FUNCTION_PARAMETERS =
       const ParserErrorCode(
           'MISSING_FUNCTION_PARAMETERS',
           "Functions must have an explicit list of parameters");
 
+  static const ParserErrorCode MISSING_METHOD_PARAMETERS = const ParserErrorCode(
+      'MISSING_METHOD_PARAMETERS',
+      "Methods must have an explicit list of parameters");
+
   static const ParserErrorCode MISSING_GET = const ParserErrorCode(
       'MISSING_GET',
       "Getters must have the keyword 'get' before the getter name");
 
   static const ParserErrorCode MISSING_IDENTIFIER =
       const ParserErrorCode('MISSING_IDENTIFIER', "Expected an identifier");
 
   static const ParserErrorCode MISSING_INITIALIZER =
       const ParserErrorCode('MISSING_INITIALIZER', "Expected an initializer");
 
@@ skipping 1679 matching lines @@
    * Copy resolution data from one node to another.
    *
    * @param fromNode the node from which resolution information will be copied
    * @param toNode the node to which resolution information will be copied
    */
   static void copyResolutionData(AstNode fromNode, AstNode toNode) {
     ResolutionCopier copier = new ResolutionCopier();
     copier._isEqualNodes(fromNode, toNode);
   }
 }