Duplicate values upon InnoDB bulk insert cause complete silent rollback

--source include/have_innodb.inc

create table t (a int) engine=InnoDB;

insert into t values (1),(2),(1);

create table t1 (a int unique) engine=InnoDB;

SET unique_checks=0, foreign_key_checks=0;

insert into t1 select * from t;

SET unique_checks=1, foreign_key_checks=1;

select * from t1;

# Cleanup

drop table t, t1;

create table t (a int) engine=InnoDB;

insert into t values (1),(2),(1);

create table t1 (a int unique) engine=InnoDB;

SET unique_checks=0, foreign_key_checks=0;

insert into t1 select * from t;

SET unique_checks=1, foreign_key_checks=1;

select * from t1;

a

drop table t, t1;