these 3 derivations will be built:
  /nix/store/dqn9gcnk0fpabgq1by9648n2vgkzpcs8-source.drv
  /nix/store/ih54h56mklril3igiysaj8yl6cbn2s0n-hindsight-1.0.0.drv
  /nix/store/2zzjpy8mdhxh8blmnnrn1gkri64c2q77-check-hindsight.drv