these 2 derivations will be built:
  /nix/store/vhdvmz5m38r8jl7m42vplf7044i1gc3i-nix-grpc-store-0.2.3.drv
  /nix/store/jkbdpynniqka2p5x5zp0yfziw843sprg-nix-grpc-store-exit-stress.drv