this derivation will be built:
  /nix/store/l1479xs9l1gfxsj9f3i4lw0kbbgph7px-fail-4.drv
error: Cannot build '/nix/store/l1479xs9l1gfxsj9f3i4lw0kbbgph7px-fail-4.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/al4zgm7c5wh8n1vkrq7k963lihd3kzlq-fail-4
       Last 2 log lines:
       > tribuchet: building on jamie
       > this build is supposed to fail
       For full logs, run:
         nix log /nix/store/l1479xs9l1gfxsj9f3i4lw0kbbgph7px-fail-4.drv