these 5 derivations will be built:
  /nix/store/5bza62syg83w402r79kxc2i2bgnal22l-dsh-0.2.1-rc.4.tgz.drv
  /nix/store/nk3kqmscmxqn89487pg13kdyvj9vspmh-dsh-source.drv
  /nix/store/hba7lknazdcywxj4j2cmmxz5j9fz9akp-dsh-0.2.1-rc.4-npm-deps.drv
  /nix/store/0sx3jzxy295swavafag9mkayn4lrdhba-dsh-0.2.1-rc.4.drv
  /nix/store/41bxmwhspwgvqw548zg8dbz2v8s7wp5w-check-dsh.drv