this derivation will be built:
  /nix/store/7ik86z2z10rxyaimqg12cl59b9km997c-fail-5.drv
error: Cannot build '/nix/store/7ik86z2z10rxyaimqg12cl59b9km997c-fail-5.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/nsjd6giaxpsb8birjl5cjsyq9rm23r6a-fail-5
       Last 2 log lines:
       > tribuchet: building on jamie
       > this build is supposed to fail
       For full logs, run:
         nix log /nix/store/7ik86z2z10rxyaimqg12cl59b9km997c-fail-5.drv