use std::fs or use::io ?
Just the contents, leaving an empty file? http://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_len
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Thank you! 按照您的提示，我解决了我的问题，再次表示由衷的感谢！，谢谢！抱歉我的英文不好。[chinese]
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