/usr/lib/ruby/2.3.0/psych_jars.rb is in libruby2.3 2.3.0-5ubuntu1.
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 | # frozen_string_literal: false
require 'psych/versions'
require 'psych.jar'
require 'jar-dependencies'
require_jar('org.yaml', 'snakeyaml', Psych::DEFAULT_SNAKEYAML_VERSION)
|