Postgresql procedure failing to compile when rollback to savepoint is mentioned

SQL error:

ERROR:  syntax error at or near "TO"
LINE 14: ROLLBACK TO SAVEPOINT a;                  ^

In statement:
CREATE OR REPLACE PROCEDURE transaction_test()
LANGUAGE plpgsql
AS $$
DECLARE
BEGIN
SAVEPOINT a;
insert into public.aocodes(id,cc_id,name,assigned_to,status,entity,created_by)
select 4,4,'101201',8,'Active',1,1;

insert into public.aocodes(id,cc_id,name,assigned_to,status,entity,created_by)
select 4,5,'101201',8,'Active',1,1;
exception
when others then
ROLLBACK TO SAVEPOINT a;
RELEASE SAVEPOINT a;
Commit;
END $$;