Does PostgreSQL have a pseudo-column like "LEVEL" in Oracle

https://stackoverflow.com/questions/22626394/does-postgresql-have-a-pseudo-column-like-level-in-oracle
Wandering around, playing around, then problems come. I tried to
crack the *level
*concept . So I followed through with the most voted answer from the above
link. The following is my code sample data.

begin;
create temp table tempemp (employee_id integer primary key, last_name
text,manager_id integer);
insert into tempemp values(1,'eliane',1);
insert into tempemp values(2,'sponge',1);
insert into tempemp values(3,'george',1);
insert into tempemp values(4,'kramer',2);
insert into tempemp values(5,'megan',2);
insert into tempemp values(6,'donald',3);
commit;

WITH RECURSIVE cte AS (
SELECT employee_id, last_name, manager_id, 1 AS level
FROM tempemp

UNION ALL
SELECT e.employee_id, e.last_name, e.manager_id, c.level + 1
FROM cte c
JOIN tempemp e ON e.manager_id = c.employee_id
)
SELECT *
FROM cte;

But when I execute the code, It seems like an infinite loop. So, any
suggestions(code sample) for me to crack the *level *concept?