--disable_warnings
drop table if exists con, aux, nul, lpt1, com1, `clock$`;
--enable_warnings

create table con (a int);
drop table con;

create table aux (a int);
drop table aux;

create table nul (a int);
drop table nul;

create table lpt1 (a int);
drop table lpt1;

create table com1 (a int);
drop table com1;

create table `clock$` (a int);
drop table `clock$`;

select convert(convert(',' using filename) using binary);

--echo #
--echo # MDEV-7677 my_charset_handler_filename has a wrong "ismbchar" member
--echo #
SET NAMES utf8;
SELECT @a:=CONVERT('aя' USING filename) AS `@a`, BINARY @a, REVERSE(@a), HEX(@a), HEX(REVERSE(@a));