Issue #20309 has been updated by Eregon (Benoit Daloze). @jeremyevans0 One issue with that replacement is it does not name the class of the object, so it's quite unclear if there is an exception with it. And also no easy way to define constants in that singleton class (and if one does `A = ...` there it will accidentally declare Object::A). I think there is nothing wrong with the singleton stdlib, so I think we should not discourage using it. There are cases where it's best to initialize a constant eagerly and that's fine, those usages do not need `singleton`. ---------------------------------------- Feature #20309: Bundled gems for Ruby 3.5 https://bugs.ruby-lang.org/issues/20309#change-107054 * Author: hsbt (Hiroshi SHIBATA) * Status: Assigned * Assignee: hsbt (Hiroshi SHIBATA) ---------------------------------------- I propose migrate the following default gems to bundled gems at Ruby 3.5. So, It means users will get warnings if users try to load them. * ostruct * I make ostruct as optional on json at https://github.com/flori/json/pull/565 * irb * We need to consider how works `binding.irb` after Ruby 3.5. * reline * readline (wrapper file for readline-ext and reline) * io-console * logger * fiddle * pstore * open-uri * yaml (wrapper file for psych) * syck is retired today. I'm not sure what people uses `psych` directly, not `yaml`. * win32ole I have a plan to migrate the following default gems too. But I need to more feedback from other committers about them. * rdoc * We need to change build task like download rdoc gem before document generation. * or We make document generation is optional from Ruby 3.5 * We explicitly separate `make install` and `make install-doc` * un * `ruby -run` is one of cool feature of Ruby. Should we avoid uninstalling `un` gem? * singleton * This is famous design pattern. Should we enforce users add them to their Gemfile? * forwadable * `reline` needs to add forwardable their `runtime_dependency` after migration. * weakref * I'm not sure how impact after migrating bundled gems. * fcntl * Should we integrate these constants into ruby core? I would like to migrate `ipaddr` and `uri` too. But these are used by webrick that is mock server for our test suite. We need to rewrite `webrick` with `TCPSocker` or extract `ipaddr` and `uri` dependency from `webrick` Other default gems depend on our build process or other libraries deeply. I will update this proposal if I could extract them from default gems. -- https://bugs.ruby-lang.org/