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2043: Instructions for VS Code Remote Development r=matklad a=marcogroppo

`rust-analyzer` can be used with the Visual Studio Code Remote Development extension pack, but `cargo xtask install` is not enough, you have to install the `VSIX` package from VS Code. 

These instructions have been added to the `README`.


Co-authored-by: Marco Groppo <marco.groppo@gmail.com>
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@ -61,6 +61,25 @@ for details.
For updates, pull the latest changes from the master branch, run `cargo xtask install` again, and **restart** VS Code instance.
See [microsoft/vscode#72308](https://github.com/microsoft/vscode/issues/72308) for why a full restart is needed.
### VS Code Remote
You can also use `rust-analyzer` with the Visual Studio Code Remote extensions
(Remote SSH, Remote WSL, Remote Containers). In this case, however, you have to
manually install the `.vsix` package:
1. Build the extension on the remote host using the instructions above (ignore the
error if `code` cannot be found in your PATH: VSCode doesn't need to be installed
on the remote host).
2. In Visual Studio Code open a connection to the remote host.
3. Open the Extensions View (`View > Extensions`, keyboard shortcut: `Ctrl+Shift+X`).
4. From the top-right kebab menu (`···`) select `Install from VSIX...`
5. Inside the `rust-analyzer` directory find the `editors/code` subdirectory and choose
the `ra-lsp-0.0.1.vsix` file.
6. Restart Visual Studio Code and re-establish the connection to the remote host.
In case of errors please make sure that `~/.cargo/bin` is in your `PATH` on the remote
host.
### Settings
* `rust-analyzer.highlightingOn`: enables experimental syntax highlighting