these 3 derivations will be built:
  /nix/store/s3xs7jcgyf8qwri28h0k19m14pz3ph20-source.drv
  /nix/store/3c939x0rvm578b51qxpxdq830vk8a006-collie-1.21.0.drv
  /nix/store/8b26gca53mqxyfjsjn9mmz4fpqcqsix3-check-collie.drv