Build failing with cargo +nightly

[Pancf]

I encountered errors like that

error[E0658]: use of unstable library feature 'array_value_iter' --> /Users/Pancf/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-ap-rustc_arena-702.0.0/src/lib.rs:134:40	134	impl<T, const N: usize> IterExt for std::array::IntoIter<T, N> {	^^^^^^^^^^^^^^^^^^^^^^^^^^

= note: see issue #65798 https://github.com/rust-lang/rust/issues/65798 for more information = help: add #![feature(array_value_iter)] to the crate attributes to enable error[E0658]: use of unstable library feature 'array_value_iter_slice' --> /Users/Pancf/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-ap-rustc_arena-702.0.0/src/lib.rs:144:18	144	self.as_slice().as_ptr().copy_to_nonoverlapping(start_ptr, len);	^^^^^^^^

= note: see issue #65798 https://github.com/rust-lang/rust/issues/65798 for more information = help: add #![feature(array_value_iter_slice)] to the crate attributes to enable error: aborting due to 2 previous errors For more information about this error, try rustc --explain E0658. error: could not compile rustc-ap-rustc_arena To learn more, run the command again with --verbose. warning: build failed, waiting for other jobs to finish... error: build failed

Env: macOS rustup 1.23.1 (3df2264a9 2020-11-30) rustc 1.49.0 (e1884a8e3 2020-12-29) rustc 1.51.0-nightly (04caa632d 2021-01-30) cargo 1.49.0 (d00d64df9 2020-12-05) cargo 1.51.0-nightly (c3abcfe8a 2021-01-25)

[calebcartwright]

Fixed in #1153, though you'll need a newer nightly (use --force with rustup update)

[look]

Thanks, I just ran into this too and running rustup update --force nightly and then re-running cargo +nightly install racer fixed it for me. 🙇