Created attachment 895515 [details] emerge --info A change to the `proc_macro_span` nightly feature was made in the 1.72.0 release: https://github.com/rust-lang/rust/pull/111571 Now, if one enables USE=nightly on new Rust versions, the hyperfine build fails. `emerge --info`, `emerge -pqv`, `build.log` attached.
Created attachment 895517 [details] emerge -pqv
Created attachment 895518 [details] build.log
Hyperfine >= 1.18.0 is not affected: https://github.com/sharkdp/hyperfine/pull/669 Looks to me like the best approach is putting <=dev-lang/rust-1.72.0 on an -r1.