~ $ ruby -v -r net/pop -e 'p $LOADED_FEATURES.select{_1 =~ %r[net/pop]}'
ruby 3.1.0preview1 (2021-11-09 master 5a3b2e6141) [x86_64-linux]
["/app/vendor/ruby-3.1.0/lib/ruby/gems/3.1.0/gems/net-pop-0.1.1/lib/net/pop.rb"]
むーん？
~ $ ruby -v -r net/pop -e 'p $LOADED_FEATURES.select{_1 =~ %r[net/pop]}'
ruby 3.1.0preview1 (2021-11-09 master 5a3b2e6141) [x86_64-linux]
["/app/vendor/ruby-3.1.0/lib/ruby/gems/3.1.0/gems/net-pop-0.1.1/lib/net/pop.rb"]
むーん？