these 3 derivations will be built:
  /nix/store/8gdilmy39znvla0ip0vil89qjkajmqcj-source.drv
  /nix/store/v600y7n4hdzv9qfzvy5snyf0kl5j4j7v-harmonia-deps-3.3.0.drv
  /nix/store/1n00ijb8jqs4hd5xlnd19slq52wyim7v-harmonia-llvm-cov-3.3.0.drv