Bogus "Unknown table" warnings produced upon attempt to drop parent table referenced by FK

--source include/have_innodb.inc

create table t1 (a int, key(a)) engine=InnoDB;

create table t2 (b int, foreign key(b) references t1(a)) engine=InnoDB;

--error ER_ROW_IS_REFERENCED_2

drop table if exists t1;

show warnings;

# Cleanup

drop table t2, t1;

drop table if exists t1;

ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails

show warnings;

Level	Code	Message

Error	1451	Cannot delete or update a parent row: a foreign key constraint fails

drop table if exists t1;

ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails

show warnings;

Level	Code	Message

Error	1451	Cannot delete or update a parent row: a foreign key constraint fails

Warning	1051	Unknown table 'test.t1'

Error	1051	Unknown table 'test.t1'