/usr/lib/ruby/vendor_ruby/ is in ruby-parslet 1.7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/parslet/
/usr/lib/ruby/vendor_ruby/parslet/export.rb
/usr/lib/ruby/vendor_ruby/parslet/transform.rb
/usr/lib/ruby/vendor_ruby/parslet/source.rb
/usr/lib/ruby/vendor_ruby/parslet/accelerator.rb
/usr/lib/ruby/vendor_ruby/parslet/expression/
/usr/lib/ruby/vendor_ruby/parslet/expression/treetop.rb
/usr/lib/ruby/vendor_ruby/parslet/pattern.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/
/usr/lib/ruby/vendor_ruby/parslet/atoms/entity.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/dynamic.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/can_flatten.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/capture.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/context.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/alternative.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/repetition.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/named.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/re.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/lookahead.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/str.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/sequence.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/visitor.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/base.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/dsl.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/scope.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms/infix.rb
/usr/lib/ruby/vendor_ruby/parslet/context.rb
/usr/lib/ruby/vendor_ruby/parslet/parser.rb
/usr/lib/ruby/vendor_ruby/parslet/convenience.rb
/usr/lib/ruby/vendor_ruby/parslet/atoms.rb
/usr/lib/ruby/vendor_ruby/parslet/position.rb
/usr/lib/ruby/vendor_ruby/parslet/slice.rb
/usr/lib/ruby/vendor_ruby/parslet/source/
/usr/lib/ruby/vendor_ruby/parslet/source/line_cache.rb
/usr/lib/ruby/vendor_ruby/parslet/expression.rb
/usr/lib/ruby/vendor_ruby/parslet/pattern/
/usr/lib/ruby/vendor_ruby/parslet/pattern/binding.rb
/usr/lib/ruby/vendor_ruby/parslet/accelerator/
/usr/lib/ruby/vendor_ruby/parslet/accelerator/application.rb
/usr/lib/ruby/vendor_ruby/parslet/accelerator/engine.rb
/usr/lib/ruby/vendor_ruby/parslet/cause.rb
/usr/lib/ruby/vendor_ruby/parslet/error_reporter.rb
/usr/lib/ruby/vendor_ruby/parslet/rig/
/usr/lib/ruby/vendor_ruby/parslet/rig/rspec.rb
/usr/lib/ruby/vendor_ruby/parslet/graphviz.rb
/usr/lib/ruby/vendor_ruby/parslet/error_reporter/
/usr/lib/ruby/vendor_ruby/parslet/error_reporter/deepest.rb
/usr/lib/ruby/vendor_ruby/parslet/error_reporter/tree.rb
/usr/lib/ruby/vendor_ruby/parslet/error_reporter/contextual.rb
/usr/lib/ruby/vendor_ruby/parslet/scope.rb
/usr/lib/ruby/vendor_ruby/parslet.rb