these 5 derivations will be built:
  /nix/store/8155l3fixfc2fhhrf717yjb6i18ij5i0-Cargo.toml.drv
  /nix/store/rvvl682zdxz5h3h4zi410v0mjbpsdqh6-Cargo.toml.drv
  /nix/store/y13h5sc3w3jzix1vrkaglfnx4jg7nl4w-source.drv
  /nix/store/m4ihiyjk9ikv3i821yiv0kx2c2c5nwb9-harmonia-deps-3.2.0.drv
  /nix/store/37ld4pwdf772xh7lymlzkqhr4gjj4jl1-harmonia-3.2.0.drv