these 2 derivations will be built:
  /nix/store/x6vj6jzj5fkhkfpr2f95nl67q72kdmf7-flake-inputs.drv
  /nix/store/lx4d3m5w7k0z72s3bv0d8rp5mwa2x4jl-check-flake-inputs.drv