CREATE EXTENSION IF NOT EXISTS anon CASCADE;
NOTICE:  installing required extension "tsm_system_rows"
SELECT anon.isloaded() IS FALSE; 
 ?column? 
----------
 t
(1 row)

SELECT anon.load();
 load 
------
 t
(1 row)

SELECT anon.isloaded() IS TRUE;
 ?column? 
----------
 t
(1 row)

SELECT anon.unload();
 unload 
--------
 t
(1 row)

SELECT anon.isloaded() IS FALSE;
 ?column? 
----------
 t
(1 row)

DROP EXTENSION anon CASCADE;