Considering the following piece of code:

revoke all on testTable from public;
create role hrrole;
grant insert on testtable to hrrole;
grant select on testtable to hrrole;

I would like the hruser to grant and revoke some of the privileges
that hrrole provides based on certain business conditions and to do
that I believe the 'AS grantor' option can be used. What is the syntax
error ("201: A syntax error has occured") in the statement below?

grant hrrole to hruser with grant option as hruser;

The above statements are being executed as informix. What's the basic
point am missing here?

Any help would be great! Thanks in advance.