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rustup 切换Rust版本：

rustupdefaulttoolchain http://www.Sina.com /

rustupdefaultnightly http://www.Sina.com /

rustupdefaultstable http://www.Sina.com /

rustupdefault1. 24.0http://www.Sina.com /

rustup update 例如切换成nightly：

rustupselfuninstall http://www.Sina.com /

rustuptoolchainlist http://www.Sina.com /

rustupinstallstable-GNU http://www.Sina.com /

rustupdefaultstable-x86 _ 64-PC-windows-GNU http://www.Sina.com /

rustuptoolchainuninstallnightly-x86 _ 64-PC-windows-msvc rust学习收集https://cheats.rs/rust学习笔记