Improve checking of patches.

sdk/lib/_internal/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.
 
 part of dart2js;
 
 class MessageKind {
   final String template;
   const MessageKind(this.template);
 
@@ skipping 367 matching lines @@
       "Optional parameters of origin and patch method '#{methodName}' must "
       "both be either named or positional.");
 
   static const PATCH_PARAMETER_MISMATCH = const MessageKind(
       "Patch method parameter '#{patchParameter}' doesn't match "
       "'#{originParameter}' on origin method #{methodName}.");
 
   static const EXTERNAL_WITHOUT_IMPLEMENTATION = const MessageKind(
       "External method without an implementation.");
 
+  static const PATCH_POINT_TO_FUNCTION = const MessageKind(
+      "Info: This is the function patch '#{functionName}'.");
+
+  static const PATCH_POINT_TO_CLASS = const MessageKind(
+      "Info: This is the class patch '#{className}'.");
+
+  static const PATCH_POINT_TO_GETTER = const MessageKind(
+      "Info: This is the getter patch '#{getterName}'.");
+
+  static const PATCH_POINT_TO_SETTER = const MessageKind(
+      "Info: This is the setter patch '#{setterName}'.");
+
+  static const PATCH_POINT_TO_CONSTRUCTOR = const MessageKind(
+      "Info: This is the constructor patch '#{constructorName}'.");
+
+  static const PATCH_NON_EXISTING = const MessageKind(
+      "Error: Origin does not exist for patch '#{name}'.");
+
+  static const PATCH_NONPATCHABLE = const MessageKind(
+      "Error: Only classes and functions can be patched.");
+
+  static const PATCH_NON_EXTERNAL = const MessageKind(
+      "Error: Only external functions can be patched.");
+
+  static const PATCH_NON_CLASS = const MessageKind(
+      "Error: Patching non-class with class patch '#{className}'.");
+
+  static const PATCH_NON_GETTER = const MessageKind(
+      "Error: Cannot patch non-getter '#{name}' with getter patch.");
+
+  static const PATCH_NO_GETTER = const MessageKind(
+      "Error: No getter found for getter patch '#{getterName}'.");
+
+  static const PATCH_NON_SETTER = const MessageKind(
+      "Error: Cannot patch non-setter '#{name}' with setter patch.");
+
+  static const PATCH_NO_SETTER = const MessageKind(
+      "Error: No setter found for setter patch '#{setterName}'.");
+
+  static const PATCH_NON_CONSTRUCTOR = const MessageKind(
+      "Error: Cannot patch non-constructor with constructor patch "
+      "'#{constructorName}'.");
+
+  static const PATCH_NON_FUNCTION = const MessageKind(
+      "Error: Cannot patch non-function with function patch "
+      "'#{functionName}'.");
+
   static const TOP_LEVEL_VARIABLE_DECLARED_STATIC = const MessageKind(
       "Top-level variable cannot be declared static.");
 
   static const WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT = const MessageKind(
       "Wrong number of arguments to assert. Should be 1, but given "
       "#{argumentCount}.");
 
   static const ASSERT_IS_GIVEN_NAMED_ARGUMENTS = const MessageKind(
       "assert takes no named arguments, but given #{argumentCount}.");
 
@@ skipping 103 matching lines @@
 
 class CompileTimeConstantError extends Diagnostic {
   CompileTimeConstantError(MessageKind kind, [Map arguments = const {}])
     : super(kind, arguments);
 }
 
 class CompilationError extends Diagnostic {
   CompilationError(MessageKind kind, [Map arguments = const {}])
     : super(kind, arguments);
 }