anchor.diff:      CLASS_BODY;
       CLASS_DECL;
       CONDITION;
  +    DIRECTIVE;
       EXPR;
       EXPR_LIST;
       EXPR_STMT;
  
positive.code:     ;
  
  directiveStatement
      : directive (';'!)?
      ;
  
  directive
  
negative.code:     INTERFACE_BODY;
      MEMBER_DECL;
      MEMBER_NAME;
      MEMBER_EXPR;
      BROKEN_MEMBER_BODY;
      METHOD_ARG;
      METHOD_DECL;
  