class IRB::ReadlineInputMethod

def initialize
  self.class.initialize_readline
  if Readline.respond_to?(:encoding_system_needs)
    IRB.__send__(:set_encoding, Readline.encoding_system_needs.name, override: false)
  end
  super
  @eof = false
  @completor = RegexpCompletor.new
  if Readline.respond_to?("basic_word_break_characters=")
    Readline.basic_word_break_characters = BASIC_WORD_BREAK_CHARACTERS
  end
  Readline.completion_append_character = nil
  Readline.completion_proc = ->(target) {
    bind = IRB.conf[:MAIN_CONTEXT].workspace.binding
    @completor.completion_candidates('', target, '', bind: bind)
  }
end