错误 rust 同步频道更新 'nightly --- (error reading rustc version)'

Question

我在自动完成时遇到了错误，所以我决定重新安装所有东西，但是这样做时出现了这个错误：

rustup update nightly

信息：同步“nightly-x86_64-unknown-linux-gnu”的频道更新

nightly-x86_64-unknown-linux-gnu 不变 - （读取 rustc 时出错 版本）

在 rustc 1.17.0 中

Answer 1

做的时候：

->rustup override set nightly-x86_64-unknown-linux-gnu
info: using existing install for 'nightly-x86_64-unknown-linux-gnu'
info: override toolchain for '/home/' set to 'nightly-x86_64-unknown-linux-gnu'

  nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.19.0-nightly (d3abc80b3 2017-05-09)

现在可以识别了：

• nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.19.0-nightly (d3abc80b3 2017-05-09)

而不是

• nightly-x86_64-unknown-linux-gnu unchanged - (error reading rustc version)

然后我会使用update nightly，因为它可能已损坏，也可能未损坏，这很正常，也许它会起作用

->rustup update nightly
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'

  nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.19.0-nightly (d3abc80b3 2017-05-09)

我做了一些测试，一开始没认出来rustc 1.19.0-nightly (d3abc80b3 2017-05-09)我不得不执行2次->rustup update nightly

---

根据当时在看可以用toolchain uninstall但是最后这个我不能确认：

->rustup toolchain uninstall nightly
info: uninstalling toolchain 'nightly-x86_64-unknown-linux-gnu'
info: toolchain 'nightly-x86_64-unknown-linux-gnu' uninstalled

->rustup self update

//..
->rustup update nightly
//..

---

注意：也许这个(error reading rustc version)真的不是什么严重的“错误”，不识别版本也可以工作rustc 1.19.0-nightly (d3abc80b3 2017-05-09)

Answer 2

rustup update 之后我得到了：

  stable-x86_64-unknown-linux-gnu unchanged - (error reading rustc version)
   nightly-x86_64-unknown-linux-gnu updated - rustc 1.19.0-nightly (978d2cfee 2017-05-10)

之后我尝试了：rustup default stable，我得到了：

  stable-x86_64-unknown-linux-gnu unchanged - rustc 1.17.0 (56124baa9 2017-04-24)

如果我再试一次rustup update，我会得到：

   stable-x86_64-unknown-linux-gnu unchanged - rustc 1.17.0 (56124baa9 2017-04-24)
  nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.19.0-nightly (978d2cfee 2017-05-10)

所以它似乎是固定的。