Mac OS release CI workflow fails: "can't find crate for core"

[bonsairobo]

I'm trying to run the release CI workflow and only Mac OS fails with this error:

error[E0463]: can't find crate for `core`
  |
  = note: the `aarch64-apple-darwin` target may not be installed
  = help: consider downloading the target with `rustup target add aarch64-apple-darwin`

error[E0463]: can't find crate for `compiler_builtins`

For more information about this error, try `rustc --explain E0463`.
error: could not compile `cfg-if` (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
Error: Process completed with exit code 101.

I'm puzzled because the workflow seems to be installing the aarch64-apple-darwin target here:

     - name: Install rust toolchain for Apple Silicon
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: stable
          targets: aarch64-apple-darwin

[NiklasEi]

That's quite strange. I don't have access to a Mac right now, but triggered CI to try to reproduce: https://github.com/NiklasEi/bevy_game_template/actions/runs/7153182125/job/19479340418

Is your project code available?

[bonsairobo]

@NiklasEi Yea here it is: https://github.com/bonsairobo/megadodge_mayhem

[NiklasEi]

The compile error is gone when you delete your rust-toolchain.toml. I guess that the target is installed for a different rust version than the one you request in the toolchain file, but I don't really understand it.

[NiklasEi]

I would consider this closed as it seemed to be a miss-configuration through the rust-toolchain.toml file.
Feel free to re-open if you see something that should be done about it in the template.

[bonsairobo]

I guess, although it's not uncommon for projects to commit a rust-toolchain.toml. Maybe there is a way to exclude it from the CI workflow.

[NiklasEi]

I think excluding it would be surprising. The best solution would be to find and use an action that supports them. The currently used action does not and is not planning to: dtolnay/rust-toolchain#12