these 2 derivations will be built:
  /nix/store/7mfcyp2ppnvv0p1n7cxwdcc4yrwpn06y-flake-inputs.drv
  /nix/store/rfil1j3dcld3grhcz46lqkxjyqv2wn4d-check-flake-inputs.drv