this derivation will be built:
  /nix/store/0pvj79wxibsarshi1p4vwdf4f14xnmcb-treefmt-check.drv
building '/nix/store/0pvj79wxibsarshi1p4vwdf4f14xnmcb-treefmt-check.drv'
treefmt-check> tribuchet: building on eliza
treefmt-check> treefmt v2.5.0traversed 28 files
treefmt-check> emitted 17 files for processing
treefmt-check> formatted 17 files (1 changed) in 77ms
treefmt-check>  M src/instantiate.rs
treefmt-check> diff --git a/src/instantiate.rs b/src/instantiate.rs
treefmt-check> index 45937c0..256d4e9 100644
treefmt-check> --- a/src/instantiate.rs
treefmt-check> +++ b/src/instantiate.rs
treefmt-check> @@ -220,18 +220,28 @@ mod tests {
treefmt-check>      fn build_flake_expression_single_attr_has_resolution_logic() {
treefmt-check>          let expr = build_flake_expression("/nix/store/x", "sha256-abc", "samba");
treefmt-check>          // Must contain all three fallback branches.
treefmt-check> -        assert!(expr.contains("f ? samba"), "missing top-level check: {expr}");
treefmt-check> -        assert!(expr.contains("f ? packages"), "missing packages branch: {expr}");
treefmt-check> +        assert!(
treefmt-check> +            expr.contains("f ? samba"),
treefmt-check> +            "missing top-level check: {expr}"
treefmt-check> +        );
treefmt-check> +        assert!(
treefmt-check> +            expr.contains("f ? packages"),
treefmt-check> +            "missing packages branch: {expr}"
treefmt-check> +        );
treefmt-check>          assert!(
treefmt-check>              expr.contains("f ? legacyPackages"),
treefmt-check>              "missing legacyPackages branch: {expr}"
treefmt-check>          );
treefmt-check> -        assert!(expr.contains("builtins.currentSystem"), "missing system: {expr}");
treefmt-check> +        assert!(
treefmt-check> +            expr.contains("builtins.currentSystem"),
treefmt-check> +            "missing system: {expr}"
treefmt-check> +        );
treefmt-check>      }
treefmt-check>  
treefmt-check>      #[test]
treefmt-check>      fn build_flake_expression_dotted_attr_is_verbatim() {
treefmt-check> -        let expr = build_flake_expression("/nix/store/x", "sha256-abc", "packages.x86_64-linux.samba");
treefmt-check> +        let expr =
treefmt-check> +            build_flake_expression("/nix/store/x", "sha256-abc", "packages.x86_64-linux.samba");
treefmt-check>          // Fully-qualified path must be embedded verbatim; no resolution wrapper.
treefmt-check>          assert!(
treefmt-check>              expr.contains("packages.x86_64-linux.samba"),
error: Cannot build '/nix/store/0pvj79wxibsarshi1p4vwdf4f14xnmcb-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/grcdqrfql6bf8ygvah66zi42gzkaf1wk-treefmt-check
       Last 25 log lines:
       > +            "missing top-level check: {expr}"
       > +        );
       > +        assert!(
       > +            expr.contains("f ? packages"),
       > +            "missing packages branch: {expr}"
       > +        );
       >          assert!(
       >              expr.contains("f ? legacyPackages"),
       >              "missing legacyPackages branch: {expr}"
       >          );
       > -        assert!(expr.contains("builtins.currentSystem"), "missing system: {expr}");
       > +        assert!(
       > +            expr.contains("builtins.currentSystem"),
       > +            "missing system: {expr}"
       > +        );
       >      }
       >
       >      #[test]
       >      fn build_flake_expression_dotted_attr_is_verbatim() {
       > -        let expr = build_flake_expression("/nix/store/x", "sha256-abc", "packages.x86_64-linux.samba");
       > +        let expr =
       > +            build_flake_expression("/nix/store/x", "sha256-abc", "packages.x86_64-linux.samba");
       >          // Fully-qualified path must be embedded verbatim; no resolution wrapper.
       >          assert!(
       >              expr.contains("packages.x86_64-linux.samba"),
       For full logs, run:
         nix log /nix/store/0pvj79wxibsarshi1p4vwdf4f14xnmcb-treefmt-check.drv