these 2 derivations will be built:
  /nix/store/34ij38ccrxn4545p7cj02663650r129j-harmonia-deps-3.2.0.drv
  /nix/store/d9c4ji105lgz2l98r2amb48g58ix4z63-harmonia-llvm-cov-3.2.0.drv