Caused by : faile to fetch "https://github.com/rust-lang/crates.io-index' if a proxy or similar is necessary ' net-git-fetch-with-cli' may help here.
Discussion
Then I googled found this : now i fixed it. in china, we need to set a china source for the crates:
cd $HOME/.cargo
But I can not find ~/.cargo, so I think I need to install rust and cargo first.
Now I am installin rust curl https://sh.rustup.rs -sSf | sh
