Cannot bootstrap rustfmt in-tree: unknown feature array_value_iter_slice

[rkowalewski]

Bootstrapping rust nightly fails when building rustfmt. I suppose this results from merging #80470, where the rustc-ap-rustc_arena crate has been modified (remove some features).

Cargo.lock still uses an old version (v697.0.0). However, it should be v702.0.0.

I build on OpenBSD current. For reference, I attached my build.log.

[jyn514]

I think this is expected behavior in some sense - rustfmt is maintained in a submodule and breaks occasionally, that's why it's not available on all nightlies. https://forge.rust-lang.org/infra/docs/rustc-ci.html#toolstate-to-support-allowed-failures

[rkowalewski]

OK, since I am not yet very familiar with the toolchain of Rust. Is there a simple workaround if I build rust nightly in-tree?

[jyn514]

You can exclude rustfmt from being built (--exclude rustfmt or just don't add it to the list of tools in config.toml).

[rkowalewski]

Thank you that solved the issue for me. Feel free to close the issue.