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

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

Index: compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java b/compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java
index d7469e5a929be11fdaa6d1e2a25590de35478fde..8038c0e6a668ee42dec4dcd136a3d106b9ec2695 100644
--- a/compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java
+++ b/compiler/java/com/google/dart/compiler/resolver/ResolverErrorCode.java
@@ -123,6 +123,7 @@ public enum ResolverErrorCode implements ErrorCode {
   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"),