these 3 derivations will be built:
  /nix/store/0cirdzywyh85m6zwafg25rjvhddp0rjy-dsh-source.drv
  /nix/store/4a05y5l2afcap81ijvha4kxkwnsq44jh-dsh-0.2.2-rc.3.drv
  /nix/store/wgb5j58kncl5bq5bp6wdw10h2mbz1v07-check-dsh.drv