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Nix Rust

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27 Oct 2025
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@crop_tech:matrix.orgcropI am using right now rust from nixpkgs. I want to use nightly for unit tests, rustup provides the possibility to switch to nightly for a single command invocation. Is there a way to do this with fennix or another overlay?11:32:30
@crop_tech:matrix.orgcrop* I am using right now rust from nixpkgs for development. I want to use nightly for unit tests, rustup provides the possibility to switch to nightly for a single command invocation. Is there a way to do this with fennix or another overlay?11:32:55
@glepage:matrix.orgGaƩtan Lepage

cargo-nextest is broken on aarch64-darwin:

error: custom attribute panicked
  --> nextest-runner/src/usdt.rs:63:1
   |
63 | #[usdt::provider(provider = "nextest")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: message: called `Result::unwrap()` on an `Err` value: IO(Os { code: 2, kind: NotFound, message: "No such file or directory" })

error[E0433]: failed to resolve: could not find `usdt_probes` in `usdt`
   --> nextest-runner/src/usdt.rs:205:23
    |
205 |           $crate::usdt::usdt_probes::run__done!(|| {
    |                         ^^^^^^^^^^^ could not find `usdt_probes` in `usdt`
    |
   ::: nextest-runner/src/runner/imp.rs:381:9
    |
381 | /         crate::fire_usdt!(UsdtRunDone {
382 | |             run_id: self.run_id,
383 | |             profile_name: self.profile.name().to_owned(),
384 | |             total_tests: run_stats.initial_run_count,
...   |
389 | |             paused_nanos: _stopwatch_end.paused.as_nanos() as u64,
390 | |         });
    | |__________- in this macro invocation
    |
    = note: this error originates in the macro `crate::fire_usdt` (in Nightly builds, run with -Z macro-backtrace for more info)
13:17:59

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