these 3 derivations will be built:
  /nix/store/zl6qdiwwg6nwvd4jbx0dcv7465ncgbw4-devshell-env.bash.drv
  /nix/store/nh5zyy217y2mdmcavvfsksyx7rxxh33k-devshell-dir.drv
  /nix/store/2065kb08mrbcwjjhihf7j09n2am65c06-devshell.drv