these 2 derivations will be built:
  /nix/store/87yc1k8rr4v98ncsmdbvahdashz8c91m-nix-grpc-store-0.2.3.drv
  /nix/store/x9sam507ppzzarbar8sb1b99zz11n5lm-nix-grpc-store-exit-stress.drv