Add hint for function named "is"

CREATE FUNCTION pg_temp.is() RETURNS text LANGUAGE sql AS $$SELECT
'x'::text$$;
SELECT 'x'||is();
ERROR: syntax error at or near "("
LINE 1: SELECT 'x'||is();

I was finally able to figure out this was because "is" needs to be
quoted; is there a way this could be hinted?

FWIW, the real-world case here comes from using pgTap, which has an is()
function. I've used that countless times by itself without quoting, so
it never occurred to me that the syntax error was due to lack of quotes.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
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