Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> We could invent some sneaky syntax variants, like 'pg_klass'::regclass
> errors, but '?pg_klass'::regclass does not.
Hmm ... cute idea, but shoehorning it into regoperator might be
problematic. You'd have to pick a flag character that wasn't a
valid operator character, which lets out '?' as well as a lot
of the other mnemonically-reasonable choices.
regards, tom lane