these 2 derivations will be built:
  /nix/store/9wjnwxkfg9r1l9wf3fvfv69h5j8y57s4-flake-inputs.drv
  /nix/store/yqxdvvhk68yg7fv0cafa49wzdbkg3ry0-check-flake-inputs.drv