# File ruby/lib/rubygems/exceptions.rb, line 23
def self.attach_correctable
  return if defined?(@attached)

  if defined?(DidYouMean::SPELL_CHECKERS) && defined?(DidYouMean::Correctable)
    if DidYouMean.respond_to?(:correct_error)
      DidYouMean.correct_error(Gem::UnknownCommandError, Gem::UnknownCommandSpellChecker)
    else
      DidYouMean::SPELL_CHECKERS["Gem::UnknownCommandError"] =
        Gem::UnknownCommandSpellChecker

      prepend DidYouMean::Correctable
    end
  end

  @attached = true
end

# File ruby/lib/rubygems/exceptions.rb, line 16
def initialize(unknown_command)
  self.class.attach_correctable

  @unknown_command = unknown_command
  super("Unknown command #{unknown_command}")
end