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#22 实现了 Tab 补全,但在使用中我发现了一个 Bug:
当我输入“p” 时,提示为 pwd。当我继续输入 “in” 后立刻按下 Tab 键,我期望可以自动补全得到“ping”,此
时提示还未更新,但程序直接把原来的提示(也就是 pwd)更新到了控制台。