Syntax error when using FULL JOIN with table aliases

A SELECT query that uses a FULL JOIN fails with a syntax error if you use table aliases in the query.

Code to reproduce:

create table a(aa int);
create table b(bb int);
insert into a values (12);
insert into b values (12);

/* Returns one row. */
select * from a full join b on aa = bb;

/* Fails with "check the manual that corresponds to your MariaDB server version for the right syntax to use near 'full join b b_alias on aa = bb' at line 1" */
select * from a a_alias full join b b_alias on aa = bb;