has_language_privilege returns incorrect answer for non-superuser

I noticed today that has_language_privilege() returns incorrect answer
for non-superuser, e.g.:

8<---------------------------------------------------
select has_language_privilege('nobody',
'plperlu',
'usage');
has_language_privilege
------------------------
t
(1 row)

test1=# \c - nobody
You are now connected to database "test1" as user "nobody".

create function f() returns text as $$ $$ language plperlu;
ERROR: permission denied for language plperlu
8<---------------------------------------------------

I verified this behavior on head as well as 9.1 (didn't bother looking
any further back). Looks like the reason is that CreateFunction()
correctly checks lanpltrusted, whereas pg_language_aclmask() does not.

Seems like a bug to me -- opinions?

Joe

--
Joe Conway
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