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Description
VSCode 在打开 rs 文件后提示安装 rust-analysis 等，但是报错了
error: toolchain 'nightly-x86_64-apple-darwin' does not contain component 'rls' for target 'x86_64-apple-darwin'解决办法：
https://github.com/rust-lang/rls#error-component-rls-is-unavailable-for-download-nightly
最终解决办法：rust-lang/rls#641 (comment)
For those who made it here looking for a workaround, the most recent toolchain I found which still has rls-preview is nightly-2019-04-19.
$ rustup toolchain install nightly-2019-04-21-x86_64-apple-darwin
$ rustup component add rls-preview --toolchain nightly-2019-04-21-x86_64-apple-darwin
Then in your VSCode user settings:
"rust-client.channel": "nightly-2019-04-21-x86_64-apple-darwin"