these 2 derivations will be built:
  /nix/store/l7jbhl5vv5q4966i8a6l3akdiqgc9ymc-nix-grpc-store-0.2.3.drv
  /nix/store/jfgpzjkzzmn4hdrhm7z2frzdv842y6w8-nix-grpc-store-exit-stress.drv