anchor.diff:      INTERFACE_DECL;
       MEMBER_NAME;
       MEMBER_TYPE;
  -    METHOD_EXPR;
       NAMED_ARG;
       VARARGS;
       NIL;
  
positive.code: tokens {
      ANNOTATION;
      ANNOTATION_LIST;
      DECLARE;
      MEMBER_DECL;
      TYPE_DECL;
      ABSTRACT_MEMBER_DECL;
  
negative.code:     TYPE_ARG_LIST;
      TYPE_NAME;
      TYPE_PARAMETER_LIST;
      WHILE_BLOCK;
      WHILE_STMT;
      SWITCH_STMT;
  