don't know how to build these paths:
  /nix/store/4nb4z2d6qp87m07q8dzsv5b7dp0z682l-iets-fmt-0.2.0.drv
warning: ignoring the client-specified setting 'store', because it is a restricted setting and you are not a trusted user
error: Cannot build '/nix/store/4nb4z2d6qp87m07q8dzsv5b7dp0z682l-iets-fmt-0.2.0.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/5av9qb2a80xsw02d1kisnwq8p1ihzxfs-iets-fmt-0.2.0
       Last 25 log lines:
       >          };
       >          let root = Derivation {
       >              name: "root".into(),
       > -            outputs: [("out".to_string(), DerivationOutput::InputAddressed(sp("root-out")))].into(),
       > +            outputs: [(
       > +                "out".to_string(),
       > +                DerivationOutput::InputAddressed(sp("root-out")),
       > +            )]
       > +            .into(),
       >              input_drvs: [(
       >                  sp("dep.drv"),
       >                  InputNode::of(used.iter().map(|s| s.to_string()).collect()),
       > Diff in /build/source/src/remote/grpc/backend.rs:746:
       >      fn a_used_missing_output_below_a_missing_root_is_built() {
       >          // `dep-out` is used and missing: `dep` joins `root` in the build set,
       >          // while the unused `dep-dev` is never even asked about
       > -        let (needs, calls) = run_raw(
       > -            &two_outputs(&["out"]),
       > -            &["root"],
       > -            &["dep-dev".into()],
       > -        );
       > +        let (needs, calls) = run_raw(&two_outputs(&["out"]), &["root"], &["dep-dev".into()]);
       >          assert_eq!(needs, vec!["dep", "root"]);
       >          assert_eq!(calls, vec![vec!["root-out"], vec!["dep-out"]]);
       >      }
       For full logs, run:
         nix log /nix/store/4nb4z2d6qp87m07q8dzsv5b7dp0z682l-iets-fmt-0.2.0.drv