Patch signatures checked in resolver.

lib/compiler/implementation/warnings.dart

 // Copyright (c) 2011, 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.
 
 class MessageKind {
   final String template;
   const MessageKind(this.template);
 
   static const GENERIC = const MessageKind('#{1}');
 
@@ skipping 246 matching lines @@
       'cannot resolve setter.');
 
   static const VOID_NOT_ALLOWED = const MessageKind(
       'type void is only allowed in a return type.');
 
   static const INVALID_SOURCE_FILE_LOCATION = const MessageKind('''
 Invalid offset (#{1}) in source map.
 File: #{2}
 Length: #{3}''');
 
+  static const PATCH_RETURN_TYPE_MISMATCH = const MessageKind(
+      "Patch return type '#{3}' doesn't match '#{2}' on origin method '#{1}'.");
+
+  static const PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH = const MessageKind(
+      "Required parameter count of patch method (#{3}) doesn't match parameter "
+      "count on origin method '#{1}' (#{2}).");
+
+  static const PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH = const MessageKind(
+      "Optional parameter count of patch method (#{3}) doesn't match parameter "
+      "count on origin method '#{1}' (#{2}).");
+
+  static const PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH = const MessageKind(
+      "Optional parameters of origin and patch method '#{1}' must "
+      "both be either named or positional.");
+
+  static const PATCH_PARAMETER_MISMATCH = const MessageKind(
+      "Patch method parameter '#{3}' doesn't match '#{2}' on origin method "
+      "#{1}.");
+
   static const COMPILER_CRASHED = const MessageKind(
       "Error: The compiler crashed when compiling this element.");
 
   static const PLEASE_REPORT_THE_CRASH = const MessageKind('''
 The compiler is broken.
 
 When compiling the above element, the compiler crashed. It is not
 possible to tell if this is caused by a problem in your program or
 not. Regardless, the compiler should not crash.
 
@@ skipping 78 matching lines @@
 
 class CompileTimeConstantError extends Diagnostic {
   CompileTimeConstantError(MessageKind kind, List arguments)
     : super(kind, arguments);
 }
 
 class CompilationError extends Diagnostic {
   CompilationError(MessageKind kind, List arguments)
     : super(kind, arguments);
 }