/usr/lib/ruby/2.3.0/tkextlib/version.rb is in ruby2.3-tcltk 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
#
# release date of tkextlib
#
module Tk
Tkextlib_RELEASE_DATE = '2010-02-01'.freeze
end
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