/usr/share/postgresql/9.5/extension/pgmemcache--2.2.0--2.3.0.sql is in postgresql-9.5-pgmemcache 2.3.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | \echo Use "ALTER EXTENSION pgmemcache UPDATE" to load this file. \quit
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