this derivation will be built:
  /nix/store/c19lqi0x3g56ccxh8v9a6vzviwbrmarq-iets-fmt-0.1.0.drv
error: Cannot build '/nix/store/c19lqi0x3g56ccxh8v9a6vzviwbrmarq-iets-fmt-0.1.0.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/hrj7516rlikp4qg0cdvagn9mrwsyzn4c-iets-fmt-0.1.0
       Last 25 log lines:
       > cargo 1.98.0 (797e8a9bc 2026-08-05)
       > +++ command cargo fmt -- --check
       > Diff in /build/source/src/builtins/mod.rs:6:
       >  pub mod core;
       >  pub mod derivation;
       >  pub mod fetch;
       > -pub mod fetch_git;
       >  pub mod fetch_closure;
       > +pub mod fetch_git;
       >  pub mod lists;
       >  pub mod math;
       >  pub mod paths;
       > Diff in /build/source/src/source/mod.rs:28:
       >  pub(crate) use local::{commit_tree, path_tree, workdir};
       >  pub use lock::Lock;
       >  pub use remote::LazyStore;
       > +pub(crate) use remote::nix_conf;
       >  pub(crate) use remote::{
       >      ensure_readable, fetch_file, fetch_git_with_nix, store_commit, valid_in_store,
       >  };
       > Diff in /build/source/src/source/mod.rs:34:
       > -pub(crate) use remote::nix_conf;
       > 
       >  #[derive(Clone, Debug, PartialEq, Eq)]
       >  pub enum AttrVal {
       For full logs, run:
         nix log /nix/store/c19lqi0x3g56ccxh8v9a6vzviwbrmarq-iets-fmt-0.1.0.drv