psql: Could we get "-- " prefixing on the **** QUERY **** outputs? (ECHO_HIDDEN)

This would be a trivial change. Willing to do it, and push it.

In effect, we have this GREAT feature:
\set ECHO_HIDDON on

Which outputs a bunch of queries (as you all know).
But somehow nobody thought that a user might want to paste ALL of the
queries into their query editor, or even into another psql session, via (\e)
and NOT get a ton of syntax errors?

As an example: (added -- and a space)

-- ********* QUERY **********
SELECT c2.relname, i.indisprimary, i.indisunique, i.indisclustered,
i.indisvalid, pg_catalog.pg_get_indexdef(i.indexrelid, 0, true),
pg_catalog.pg_get_constraintdef(con.oid, true), contype, condeferrable,
condeferred, i.indisreplident, c2.reltablespace
FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i
LEFT JOIN pg_catalog.pg_constraint con ON (conrelid = i.indrelid AND
conindid = i.indexrelid AND contype IN ('p','u','x'))
WHERE c.oid = '21949943' AND c.oid = i.indrelid AND i.indexrelid = c2.oid
ORDER BY i.indisprimary DESC, c2.relname;
-- **************************

-- ********* QUERY **********
SELECT pol.polname, pol.polpermissive,
CASE WHEN pol.polroles = '{0}' THEN NULL ELSE
pg_catalog.array_to_string(array(select rolname from pg_catalog.pg_roles
where oid = any (pol.polroles) order by 1),',') END,
pg_catalog.pg_get_expr(pol.polqual, pol.polrelid),
pg_catalog.pg_get_expr(pol.polwithcheck, pol.polrelid),
CASE pol.polcmd
WHEN 'r' THEN 'SELECT'
WHEN 'a' THEN 'INSERT'
WHEN 'w' THEN 'UPDATE'
WHEN 'd' THEN 'DELETE'
END AS cmd
FROM pg_catalog.pg_policy pol
WHERE pol.polrelid = '21949943' ORDER BY 1;
-- **************************

Kirk...