this derivation will be built:
  /nix/store/v7dydwckzp59w98jrpmq41qfm3h90xk5-fail-5.drv
error: Cannot build '/nix/store/v7dydwckzp59w98jrpmq41qfm3h90xk5-fail-5.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/n6n18y06gsczf3ykzfgy3sckpjj66hib-fail-5
       Last 2 log lines:
       > tribuchet: building on jamie
       > this build is supposed to fail
       For full logs, run:
         nix log /nix/store/v7dydwckzp59w98jrpmq41qfm3h90xk5-fail-5.drv