This file is indexed.

/usr/share/postgresql/9.1/extension/autoinc--1.0.sql is in postgresql-contrib-9.1 9.1.3-2.

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The actual contents of the file can be viewed below.

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

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

CREATE FUNCTION autoinc()
RETURNS trigger
AS 'MODULE_PATHNAME'
LANGUAGE C;