/usr/lib/ruby/ is in asciidoctor 0.1.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/asciidoctor/
/usr/lib/ruby/vendor_ruby/asciidoctor.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/abstract_block.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/abstract_node.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/attribute_list.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/backends/
/usr/lib/ruby/vendor_ruby/asciidoctor/backends/_stylesheets.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/backends/base_template.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/backends/docbook45.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/backends/docbook5.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/backends/html5.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/block.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/callouts.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/cli/
/usr/lib/ruby/vendor_ruby/asciidoctor/cli/invoker.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/cli/options.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/debug.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/document.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/extensions.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/helpers.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/inline.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/lexer.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/list.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/path_resolver.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/reader.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/renderer.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/section.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/substituters.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/table.rb
/usr/lib/ruby/vendor_ruby/asciidoctor/version.rb