these 3 derivations will be built:
  /nix/store/p49307y1pkwnqgzw2xiz9j1i0fx717dk-clan-cli-source.drv
  /nix/store/9rlf7f405wnav3x4635dinlmdafrzw8z-clan-cli.drv
  /nix/store/61k9hnwizipv60ml8lg3jf4b5mx81i1r-nix-shell.drv