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add suggested workflow to setup nightly rustup for rustc

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Gus Wynn 2020-09-16 16:04:40 -07:00 committed by Joshua Nelson
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@ -67,6 +67,22 @@ the problem. A nice side-effect of this style is that you are left
with a fairly fine-grained set of commits at the end, all of which
build and pass tests. This often helps reviewing.
## Configuring `rustup` to use nightly
Some parts of the bootstrap process uses pinned, nightly versions of tools like
rustfmt. To make things like `cargo fmt` work correctly in your repo, run
```console
cd <path to rustc repo>
rustup override set nightly
```
after [installing a nightly toolchain] with `rustup`. Don't forget to do this for all
directories you have [setup a worktree for].
[installing a nightly toolchain]: https://rust-lang.github.io/rustup/concepts/channels.html?highlight=nightl#working-with-nightly-rust
[setup a worktree for]: ./suggested.html#working-on-multiple-branches-at-the-same-time
## Incremental builds with `--keep-stage`.
Sometimes just checking