/usr/lib/ruby/vendor_ruby/treetop.rb is in ruby-treetop 1.4.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | require 'treetop/runtime'
require 'treetop/compiler'
require 'treetop/polyglot'
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