these 2 derivations will be built:
  /nix/store/636gfg6c4qzrkkvj6p7hhn4rvfwq0sxz-bernstein-3.21.0.drv
  /nix/store/pxqwqjbni9dybp550y6m7xdxgzvzlmaf-check-bernstein.drv