This file is indexed.

/usr/share/postgresql/9.3/extension/autoinc--unpackaged--1.0.sql is in postgresql-contrib-9.3 9.3.24-0ubuntu0.14.04.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* contrib/spi/autoinc--unpackaged--1.0.sql */

-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION autoinc FROM unpackaged" to load this file. \quit

ALTER EXTENSION autoinc ADD function autoinc();