these 5 derivations will be built:
  /nix/store/0ybqhxk2faqynxqvni83vbyx3cnnbivh-Cargo.toml.drv
  /nix/store/mkycyg6q18z4qzjpi3rj8gx4p52avx90-Cargo.toml.drv
  /nix/store/4h10msq7cjb411vwayadgsh6xy2id9sp-source.drv
  /nix/store/mhrmg7iz28aidr2rw45l39ycy5fm57vx-harmonia-deps-3.2.0.drv
  /nix/store/qmznnqwiqq7ll54b4p5zlvbaz2a49n1g-harmonia-3.2.0.drv