class Byebug::DeleteDisplayCommand

def execute
  unless pos = @match[1]
    if confirm("Clear all expressions? (y/n) ")
      for d in @state.display
        d[0] = false
      end
    end
  else
    pos = get_int(pos, "Undisplay")
    return unless pos
    if @state.display[pos-1]
      @state.display[pos-1][0] = nil
    else
      errmsg "Display expression %d is not defined.\n", pos
    end
  end
end