these 3 derivations will be built:
  /nix/store/1cqmjfiw4zll7vklc468izjrd9jgr9fw-dsh-source.drv
  /nix/store/il0vjq5a3j9jqz1iln7a5ffa0yv6zrs8-dsh-0.2.1-rc.3.drv
  /nix/store/n2dm993558vfqrpxskxf8pv21i2skpfk-check-dsh.drv