these 4 derivations will be built:
  /nix/store/5x2p1sxvbdg965rgiyq3137f11plr1vd-Cargo.toml.drv
  /nix/store/xhi9a9ziqqnzcdk39cmic8mhwsizvl82-source.drv
  /nix/store/jnz1d55nl0fd0z8l2l1sbbxr97zp9hsk-harmonia-deps-3.3.0.drv
  /nix/store/4xc815n1ghfkwv4dbxzi0l0n7rvf0dbh-harmonia-3.3.0.drv