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The `exe` folder and `lib` folder of default gems don't locate under the same place. While `exe/irb` will be under the gem folder, `irb.rb` will be under `lib/ruby/VERSION/`. So `require_relative` will make `irb` unuseable when shipped with Ruby. Related discussion in the comments: https://github.com/ruby/irb/pull/335 https://github.com/ruby/irb/commit/99d3aa979d