these 2 derivations will be built:
  /nix/store/9q65gw1blw6ywcv2pjkf9d11rxnnyqkq-lean-ctx-3.11.0.drv
  /nix/store/8hq36v6cgv6rh98qkdl40s0qcmjkhyan-check-lean-ctx.drv