single quotes make SHOW CREATE USER invalid

source include/have_unix_socket.inc;

CREATE USER 'x''y'@localhost IDENTIFIED VIA unix_socket USING 'x''y' REQUIRE SUBJECT 'x''y';

GRANT PROXY ON 'x''y'@localhost to 'x''y'@localhost;

SHOW CREATE USER 'x''y'@localhost;

SHOW GRANTS FOR 'x''y'@localhost;

DROP USER 'x''y'@localhost;