Issue 3752. Support for @override annotations (as structured doc comments)

compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java

 // Copyright (c) 2012, 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.
 package com.google.dart.compiler.resolver;
 
 import com.google.dart.compiler.ErrorCode;
 import com.google.dart.compiler.ErrorSeverity;
 import com.google.dart.compiler.SubSystem;
 
 /**
@@ skipping 105 matching lines @@
   ILLEGAL_ACCESS_TO_PRIVATE_MEMBER("\"%s\" refers to \"%s\" which is in a different library"),
   ILLEGAL_CONSTRUCTOR_NO_DEFAULT_IN_INTERFACE(
       "Illegal constructor declaration.  No default clause in interface"),
   ILLEGAL_FIELD_ACCESS_FROM_STATIC("Illegal access of instance field %s from static scope"),
   ILLEGAL_METHOD_ACCESS_FROM_STATIC("Illegal access of instance method %s from static scope"),
   INIT_FIELD_ONLY_IMMEDIATELY_SURROUNDING_CLASS(
       "Only fields of immediately surrounding class can be initialized"),
   INSTANCE_METHOD_FROM_REDIRECT("Instance methods cannot be referenced from constructor redirects"),
   INSTANCE_METHOD_FROM_STATIC("Instance methods cannot be referenced from static methods"),
   INTERNAL_ERROR("internal error: %s"),
+  INVALID_OVERRIDE_METADATA("Method marked with @override, but does not override any superclass element"),

[Brian Wilkerson, 2012/06/25 14:24:38]

This should be a warning, not an error.

I think we need some way to recognize warnings that are not part of the spec. so
that we can ignore them if the user doesn't want to see them. I might be missing
it, but I don't see that here. (Fixing in a separate CL is preferred.)

[scheglov, 2012/06/26 19:46:34]

I saw that ErrorSeverity.INFO was added for this.

   INVALID_RETURN_IN_CONSTRUCTOR("Generative constructors cannot return arbitrary expressions"),
   INVALID_TYPE_NAME_IN_CONSTRUCTOR("Invalid type in constructor name"),
   IS_A_CLASS("%s is a class and cannot be used as an expression"),
   IS_A_CONSTRUCTOR("%s.%s is a constructor, expected a  method"),
   IS_AN_INSTANCE_METHOD("%s.%s is an instance method, not a static method"),
   LIST_LITERAL_ELEMENT_TYPE(
       "List literal element type must match declaration '%s' when type checks are on."),
   MAIN_FUNCTION_PARAMETERS(
       ErrorSeverity.WARNING, "Top-level function 'main' should not have parameters."),
   MAP_LITERAL_ELEMENT_TYPE(
@@ skipping 77 matching lines @@
   @Override
   public SubSystem getSubSystem() {
     return SubSystem.RESOLVER;
   }
 
   @Override
   public boolean needsRecompilation() {
     return true;
   }
 }