these 3 derivations will be built:
  /nix/store/p51hvszzcgnbs67nfb03c7ckabym5wm1-treefmt.toml.drv
  /nix/store/galasp0m51vp5rncxvj9fwsqpf8vrz67-treefmt.drv
  /nix/store/si5dmxjgn3i1fmkc0z80civyj31i9gqa-treefmt-check.drv
this path will be fetched (774.7 KiB download, 1.8 MiB unpacked):
  /nix/store/0pcwwnii74w0cvjgpf8lbsrc19c2wmkh-alejandra-4.0.0
error: Cannot build '/nix/store/si5dmxjgn3i1fmkc0z80civyj31i9gqa-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/806q6qbnw113a1hm60y9yh9lvi5vqhpc-treefmt-check
       Last 25 log lines:
       > +  };
       >  }
       > diff --git a/tests/hello-flake-v2/flake.nix b/tests/hello-flake-v2/flake.nix
       > index 8b5f577..b4181ee 100644
       > --- a/tests/hello-flake-v2/flake.nix
       > +++ b/tests/hello-flake-v2/flake.nix
       > @@ -1,12 +1,10 @@
       >  {
       >    description = "Hello flake v2";
       >
       > -  outputs =
       > -    { self }:
       > -    {
       > -      packages.x86_64-linux.default = import ./default.nix;
       > -      packages.aarch64-linux.default = import ./default.nix;
       > -      packages.x86_64-darwin.default = import ./default.nix;
       > -      packages.aarch64-darwin.default = import ./default.nix;
       > -    };
       > +  outputs = { self }: {
       > +    packages.x86_64-linux.default = import ./default.nix;
       > +    packages.aarch64-linux.default = import ./default.nix;
       > +    packages.x86_64-darwin.default = import ./default.nix;
       > +    packages.aarch64-darwin.default = import ./default.nix;
       > +  };
       >  }
       For full logs, run:
         nix log /nix/store/si5dmxjgn3i1fmkc0z80civyj31i9gqa-treefmt-check.drv