these 2 derivations will be built:
  /nix/store/mphsvsmy9d5m8r0csl2k48al2x1313wf-nix-grpc-store-0.2.3.drv
  /nix/store/vm5n4fjc1s73hg1fbvbva4g9xc0s981y-nix-grpc-store-exit-stress.drv