these 5 derivations will be built:
  /nix/store/b9i9axhg6zrl61lnqax7x2saxwkw7yhj-dsh-0.2.2-rc.3.tgz.drv
  /nix/store/zvd4ygjgxsnavr9mf1fpp4sd67j2pfxm-dsh-source.drv
  /nix/store/nracpxnxvdpzsmahxj9k8wqvyjyg9i0x-dsh-0.2.2-rc.3-npm-deps.drv
  /nix/store/q1f9c4js9vm8dhbzd01gcvqz2j7n3hik-dsh-0.2.2-rc.3.drv
  /nix/store/fjbdijq6c0yp93ap4kk9kf6mgy4n4wp7-check-dsh.drv