# File lib/rbreadline.rb, line 6989
  def rl_tty_unset_default_bindings(kmap)
    # Don't bother before we've saved the tty special chars at least once.
    return if (!rl_isstate(RL_STATE_TTYCSAVED))

    kmap[@_rl_tty_chars.t_erase] = :rl_insert
    kmap[@_rl_tty_chars.t_kill] = :rl_insert
    kmap[@_rl_tty_chars.t_lnext] = :rl_insert
    kmap[@_rl_tty_chars.t_werase] = :rl_insert
  end