these 6 derivations will be built:
  /nix/store/3d559f5kd10bz0qqsg7rjknh9p150bc6-Cargo.toml.drv
  /nix/store/5jphhgzvldm396jkj4i76skyrrdn67vw-Cargo.toml.drv
  /nix/store/8xca4cx2prgmnns1w7dl1k66cs3lamj2-Cargo.toml.drv
  /nix/store/i0d7kvn6pizczf1mdcqqw7cnm2prywiv-source.drv
  /nix/store/jd713ywwvvg8j2lfand3p6lb8h2sw046-flt-deps-0.1.0.drv
  /nix/store/wnhc63w2nj5qgnjrjis10c1c3xkb1nkd-flt-0.1.0.drv