init: macOS apple silicon runner

[LeviticusNelson]

I started the first steps to have aarch64-apple-darwin builds possible for rustfmt so that that people who use the aarch64-apple-darwin target can use the latest rustfmt builds.

[ytmimi]

Thanks for the PR, but we're going to move away from distributing pre-built binaries in the future. You can read the discussion on #5761 for more details.

The recommendation is for users to get rustfmt via rustup

# stable
rustup component add rustfmt

# nightly
rustup component add rustfmt --toolchain nightly

[LeviticusNelson]

It seems that I cannot use the nightly version of rustfmt so I just installed via homebrew

brew install rustfmt

[ytmimi]

@LeviticusNelson did you mean rustfmt and not rustfml?

[LeviticusNelson]

Yes, I meant to write rustfmt but after figuring out how to run this tool all morning my heart was feeling the fml 😂

[ytmimi]

I'm glad that you were able to get rustfmt installed and working. I'm a bit surprised that things didn't work when you tried to install rustfmt via rustup though, and that you needed to install it via homebrew. Do you have a rust toolchain installed? If not that could be the issue.

I ask because on my mac I'm using the nightly-aarch64-apple-darwin toolchain and I don't have any issue running rustfmt.

[LeviticusNelson]

I was running this command while having my default set to nightly:

rustup component add rustfmt --toolchain nightly

# output
info: component 'rustfmt' for target 'aarch64-apple-darwin' is up to date

This seems to still be running the stable version of rustfmt for some reason

[ytmimi]

I'd double check whether or not you're using a nightly toolchain by default. What do you see for you active toolchain when you run rustup show?

active toolchain
----------------

nightly-aarch64-apple-darwin (default)

Assuming that your default toolchain is stable, if you just want to run nightly rustfmt on an ad hoc basis you can run rustfmt +nightly path/to/rust_file.rs or cargo +nightly fmt.

Note: You can't pass file paths to cargo fmt

You can run rustup override nightly to set a nightly toolchain for a specific directory, while still using a stable toolchain everywhere else. Then executing rustfmt path/to/rust_file.rs should get forwarded to nightly rustfmt when running in that directory.

Alternatively, you can run rustup default nightly to set the default toolchain on your system to nightly. Then all calls to rustfmt path/to/rust_file.rs should use the nightly version, and if you want to use stable for some reason you could run rustfmt +stable or cargo +stable fmt

[LeviticusNelson]

I had to clear out $HOME/.cargo and reinstall rustup to get this to work properly. Thanks for the concise assistance!