Bogus error message for query using recursive CTE

MariaDB [test]> create table t1 (a int);

Query OK, 0 rows affected (0.06 sec)

MariaDB [test]> insert into t1 values

    ->   (0), (1), (2), (3), (4);

Query OK, 5 rows affected (0.01 sec)

Records: 5  Duplicates: 0  Warnings: 0

MariaDB [test]> create table t2 (a int);

Query OK, 0 rows affected (0.05 sec)

MariaDB [test]> insert into t2 values

    ->   (1), (2), (3), (4), (5);

Query OK, 5 rows affected (0.01 sec)

Records: 5  Duplicates: 0  Warnings: 0

MariaDB [test]> create view v1 as

    ->   select a from t2 where a < 3

    ->   union

    ->   select a from t2 where a > 4; 

Query OK, 0 rows affected (0.01 sec)

MariaDB [test]> with recursive

    -> t1 as

    -> (

    -> select a from v1 where a=1 

    -> union

    -> select v1.a from t1,v1 where t1.a+1=v1.a

    -> )

    -> select * from t1;

ERROR 4007 (HY000): Reference to recursive WITH table 't1' in materialized derived