Error when building cookcli

[plalevee]

When executing "cargo build --release", after git cloning, I have this error:
error[E0658]: use of unstable library feature round_char_boundary
--> /home/philoo/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/cooklang-language-server-0.2.1/src/completion.rs:114:27
|
114 | let scan_start = text.ceil_char_boundary(byte_start);
| ^^^^^^^^^^^^^^^^^^
|
= note: see issue #93743 rust-lang/rust#93743 for more information

Compiling textwrap v0.16.2
For more information about this error, try rustc --explain E0658.
error: could not compile cooklang-language-server (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...

I haven't found a way to build cookcli.

I am using cookyos Linux Distribution. I also tried using the arch installer: "yay -S cookcli" and I get the same error.
Thanks for your help.

[dubadub]

What version of rust do you use?

[plalevee]

Hi, $ rustc --version rustc 1.90.0 (1159e78c4 2025-09-14)

[dubadub]

Thanks for reporting! The ceil_char_boundary method used in cooklang-language-server was stabilized in Rust 1.73.0, so your Rust 1.90.0 should be able to compile it without issues.

A couple of things to check:

1. Verify the actual toolchain used during build — sometimes a different toolchain gets picked up. Could you share the output of rustup show?

2. When building via yay — the AUR PKGBUILD might use a different Rust version than the one you have installed via rustup. The system-packaged Rust (from pacman) could be older. Check with:

   /usr/bin/rustc --version
   

   vs.

   ~/.cargo/bin/rustc --version
   

3. Try updating your toolchain:

   rustup update stable
   

Let me know what you find and we'll go from there.

[plalevee]

Hi Alex,
You're right. The rustc version in .cargo/bin is 1.90 while the one in /usr/bin is 1.94. By compiling cookcli and forcing the use of /usr/bin/rustc, I no longer have any errors.
It seems that the problem is with the distribution. If I update rustup, pacman tells me there's a conflict with rustc, which I need to remove.