public EventSpec CreateEvent(EventInfo ei, TypeSpec declaringType, MethodSpec add, MethodSpec remove)
{
add.IsAccessor = true;
remove.IsAccessor = true;
if (add.Modifiers != remove.Modifiers)
throw new NotImplementedException ("Different accessor modifiers " + ei.Name);
var event_type = ImportType (ei.EventHandlerType, new DynamicTypeReader (ei));
var definition = new ImportedMemberDefinition (ei, event_type, this);
return new EventSpec (declaringType, definition, event_type, add.Modifiers, add, remove);
}