/usr/lib/ruby/2.3.0/optparse/uri.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 7 | # frozen_string_literal: false
# -*- ruby -*-
require 'optparse'
require 'uri'
OptionParser.accept(URI) {|s,| URI.parse(s) if s}
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