/usr/share/postgresql/9.5/extension/pgpool_regclass--1.0.sql is in postgresql-9.5-pgpool2 3.4.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | -- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pgpool_regclass" to load this file. \quit
CREATE FUNCTION pg_catalog.pgpool_regclass(IN expression cstring)
RETURNS oid
AS 'MODULE_PATHNAME', 'pgpool_regclass'
LANGUAGE C STRICT;
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