these 2 derivations will be built:
  /nix/store/jlj87yskcl06y3x60ikijl2pnkawshhp-harmonia-deps-3.3.0.drv
  /nix/store/kwqj3nap5c8xgcgmdxbxypl2k6z2rivv-harmonia-llvm-cov-3.3.0.drv