these 2 derivations will be built:
  /nix/store/z3ygk3b22kbf4a3h9cady7fffygh4f2i-md-format.tests.nix.drv
  /nix/store/5f5a7c7768yl3fi2nhs00rfm9kgw8hg7-evalCheck-md-format.drv