/usr/lib/ruby/ is in ruby-did-you-mean 1.0.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/did_you_mean/
/usr/lib/ruby/vendor_ruby/did_you_mean/jaro_winkler.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/extra_features.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/verbose_formatter.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/extra_features/
/usr/lib/ruby/vendor_ruby/did_you_mean/extra_features/initializer_name_correction.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/extra_features/ivar_name_correction.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/formatter.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/levenshtein.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkable.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/core_ext/
/usr/lib/ruby/vendor_ruby/did_you_mean/core_ext/name_error.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/version.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkers/
/usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkers/name_error_checkers.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkers/method_name_checker.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkers/null_checker.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkers/name_error_checkers/
/usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
/usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
/usr/lib/ruby/vendor_ruby/did_you_mean.rb