these 2 derivations will be built:
  /nix/store/6p9253hr19xgrzidsvc0dhzbjz2v1004-nix-grpc-store-0.2.2.drv
  /nix/store/sfq1hdfhzbr1r5g9plx4qfixp0mg3h5x-nix-grpc-store-exit-stress.drv