anchor.diff:      INTERFACE_DECL;
       MEMBER_NAME;
       MEMBER_TYPE;
  -    METHOD_EXPR;
       NAMED_ARG;
       VARARGS;
       NIL;
  
positive.code:     CLASS_BODY;
      CLASS_DECL;
      CONDITION;
      DECL_MODIFIER;
      DO_BLOCK;
      DO_ITERATOR;
      DO_ITERATOR;
      EXPR;
      FINALLY_BLOCK;
  
negative.code: tokens {
      ANNOTATION;
      ANNOTATION_LIST;
      MEMBER_DECL;
      TYPE_DECL;
      ABSTRACT_MEMBER_DECL;
  