these 2 derivations will be built:
  /nix/store/0lh51b2ipq2qc8y8azw2imvx8f46dzf9-harmonia-deps-3.2.0.drv
  /nix/store/yjzxp3pa308ddwf1680x860g2xwmjc3f-harmonia-llvm-cov-3.2.0.drv