Rust 初探 - 环境配置、镜像源修改

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Rust Crates 镜像使用帮助
https://lug.ustc.edu.cn/wiki/mirrors/help/rust-crates

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2019-03-05
官网好像撤掉了离线 rust 安装包的链接？
现在的安装方式是下载 rustup-inst.exe 执行在线安装。

如果之前已经通过其他方式安装过，执行 rustup-inst 的窗口可能会一闪而过。

C:\Users\%UserName%\Desktop>rustup-init.exe
  error: it looks like you have an existing installation of Rust at:
  error: C:\Program Files\Rust stable GNU 1.30\bin
  error: rustup cannot be installed alongside Rust. Please uninstall first
  error: if this is what you want, restart the installation with `-y'
  error: cannot install while Rust is installed