[bug] src-tauri compile error when compiling ignore v0.4.21: use of unstable library feature 'once_cell'

[rauerhans]

Describe the bug

first time tauri user, out of the box the src-tauri cargo build fails with

e2e-scaffold/roster-sloth/src-tauri on  main [!?⇡] is 📦 v0.0.0 via 🦀 v1.74.1 on ☁️  (us-east-2) on ☁️  hans@plural.sh 
❯ cargo update
    Updating crates.io index

e2e-scaffold/roster-sloth/src-tauri on  main [!?⇡] is 📦 v0.0.0 via 🦀 v1.74.1 on ☁️  (us-east-2) on ☁️  hans@plural.sh 
❯ cargo build 
   Compiling treediff v4.0.2
   Compiling html5ever v0.26.0
   Compiling toml v0.7.8
   Compiling toml v0.8.8
   Compiling wry v0.24.6
   Compiling serialize-to-javascript v0.1.1
   Compiling ignore v0.4.21
   Compiling embed_plist v1.2.2
   Compiling state v0.5.3
error[E0658]: use of unstable library feature 'once_cell'
   --> /Users/hans.rauer/.cargo/registry/src/github.com-1ecc6299db9ec823/ignore-0.4.21/src/gitignore.rs:596:9
    |
596 |     use std::sync::OnceLock;
    |         ^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #74465 <https://github.com/rust-lang/rust/issues/74465> for more information

error[E0658]: use of unstable library feature 'once_cell'
   --> /Users/hans.rauer/.cargo/registry/src/github.com-1ecc6299db9ec823/ignore-0.4.21/src/gitignore.rs:603:16
    |
603 |     static RE: OnceLock<Regex> = OnceLock::new();
    |                ^^^^^^^^^^^^^^^
    |
    = note: see issue #74465 <https://github.com/rust-lang/rust/issues/74465> for more information

error[E0658]: use of unstable library feature 'once_cell'
   --> /Users/hans.rauer/.cargo/registry/src/github.com-1ecc6299db9ec823/ignore-0.4.21/src/gitignore.rs:603:34
    |
603 |     static RE: OnceLock<Regex> = OnceLock::new();
    |                                  ^^^^^^^^
    |
    = note: see issue #74465 <https://github.com/rust-lang/rust/issues/74465> for more information

   Compiling json-patch v1.2.0
error[E0658]: use of unstable library feature 'once_cell'
   --> /Users/hans.rauer/.cargo/registry/src/github.com-1ecc6299db9ec823/ignore-0.4.21/src/gitignore.rs:603:34
    |
603 |     static RE: OnceLock<Regex> = OnceLock::new();
    |                                  ^^^^^^^^^^^^^
    |
    = note: see issue #74465 <https://github.com/rust-lang/rust/issues/74465> for more information

error[E0658]: use of unstable library feature 'once_cell'
   --> /Users/hans.rauer/.cargo/registry/src/github.com-1ecc6299db9ec823/ignore-0.4.21/src/gitignore.rs:604:17
    |
604 |     let re = RE.get_or_init(|| {
    |                 ^^^^^^^^^^^
    |
    = note: see issue #74465 <https://github.com/rust-lang/rust/issues/74465> for more information

For more information about this error, try `rustc --explain E0658`.
error: could not compile `ignore` due to 5 previous errors
warning: build failed, waiting for other jobs to finish...

Reproduction

No response

Expected behavior

should compile without errors

Platform and versions

[✔] Environment
    - OS: Mac OS 13.4.1 X64
    ✔ Xcode Command Line Tools: installed
    ✔ rustc: 1.68.0 (2c8cc3432 2023-03-06) (built from a source tarball)
    ✔ cargo: 1.68.0 (115f34552 2023-02-26)
    ✔ rustup: 1.26.0 (5af9b9484 2023-04-05)
    ✔ Rust toolchain: stable-aarch64-apple-darwin (default)
    - node: 21.2.0
    - yarn: 1.22.19
    - npm: 10.2.3

[-] Packages
    - tauri [RUST]: 1.5.3
    - tauri-build [RUST]: 1.5.0
    - wry [RUST]: 0.24.6
    - tao [RUST]: 0.16.5
    - @tauri-apps/api [NPM]: 1.5.1
    - @tauri-apps/cli [NPM]: 1.5.7

[-] App
    - build-type: bundle
    - CSP: unset
    - distDir: ../dist
    - devPath: http://localhost:1420/
    - framework: React
    - bundler: Vite

### Stack trace

_No response_

### Additional context

_No response_

[FabianLars]

If you can, update your rust version (rustup update), if you can't, try downgrading ignore cargo update -p ignore --precise 0.4.18. We unfortunetly can't fix that on our side.

[FabianLars]

Ah sorry, your terminal shows a newer rust version than tauri detects, and since tauri uses a direct rustc call it should report the same version that it will use for cargo build so i assume you have 2 rust installations that conflict with each other, maybe one via homebrew?

[chnkarl]

run rusrup update update rust, then it worked for me.

[rauerhans]

Yes somehow that got mixed up with an existing older version of rustc in my usr/local/bin, good eye!