Building fails

[junocomp]

It fails to build cpuio

here's the log

Compiling cpuio v0.3.0
error[E0554]: `#![feature]` may not be used on the stable release channel
 --> /home/user/.cargo/registry/src/suiyiyu.us.kg-1ecc6299db9ec823/cpuio-0.3.0/src/lib.rs:4:1
  |
4 | #![feature(llvm_asm, const_fn)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0554`.
error: could not compile `cpuio`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

[Antevea]

Hello, @giovannicaligaris.
cpuio lib requires nightly Rust.

[Antevea]

I have updated README.md.

[junocomp]

Sorry for the delay.

I now have nightly set as default and still getting an error

error[E0557]: feature has been removed
 --> /home/user/.cargo/registry/src/suiyiyu.us.kg-1ecc6299db9ec823/cpuio-0.3.0/src/lib.rs:4:22
  |
4 | #![feature(llvm_asm, const_fn)]
  |                      ^^^^^^^^ feature has been removed
  |
  = note: split into finer-grained feature gates

error: aborting due to previous error

For more information about this error, try `rustc --explain E0557`.
error: could not compile `cpuio`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

[Antevea]

Hello, @giovannicaligaris! This is new problem with cpuio lib on fresh rust version(
cpuio repository has opened issue (1 june 2021) emk/toyos-rs#9.
Wait for merge into master branch to fix this problem.

[junocomp]

Hi, thanks for the update.

I am running rustc 1.55.0-nightly (868c702d0 2021-06-30)