Issue #19776 has been updated by hsbt (Hiroshi SHIBATA). I submit https://github.com/rubygems/rubygems/pull/6831 to RubyGems upstream. ---------------------------------------- Bug #19776: Warn bundled gems when it called from `require` https://bugs.ruby-lang.org/issues/19776#change-103934 * Author: hsbt (Hiroshi SHIBATA) * Status: Assigned * Priority: Normal * Assignee: hsbt (Hiroshi SHIBATA) * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- We should warn when users try to load default gems that will be promoted bundled gems at next version. We will warn them only under the bundler environment without Gemfile. * Ruby 3.3: * Warn for adding bundled gems to be addressed Ruby 3.4 to Gemfile when user load its gem without `gem 'foo'` in their Gemfile. * Target libraries are TBD * Also warn existing bundled gems was loaded without `gem 'foo'` of Gemfile. Ex. net-smtp, rexml etc. * Ruby 3.4: * Promote bundled gems. * Raise LoadError same as current behavior with warnings of Ruby 3.3. * Warn same as Ruby 3.3. I implemented PoC for this: https://github.com/ruby/ruby/pull/8096 -- https://bugs.ruby-lang.org/