安装rust
curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh
设置环境
source $HOME/.cargo/env
如果brew出现错误，则按照提示输入。
Error: homebrew-core is a shallow clone. To `brew update` first run:
git -C "/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core" fetch --unshallow
如果又出现这个错误
fatal: dumb http transport does not support shallow capabilities
则删掉homebrew-core重新clone一个
cd /usr/local/Homebrew/Library/Taps/homebrew/
rm -rf homebrew-core
git clone https://github.com/Homebrew/homebrew-core.git
之后，homebrew就正常了。
