these 3 derivations will be built:
  /nix/store/skjvdgd41h0npmpnbpr1ba2v8ydb5lrh-clan-cli-source.drv
  /nix/store/20jfxghl61q3rf3n8ljfycwamxgmigc2-clan-cli.drv
  /nix/store/z358gl6mdvs9i8zvhf0yp3amvx9hf0yf-nix-shell.drv