these 4 derivations will be built:
  /nix/store/740465pji8glkglw9x5s449wsipv1qd0-Cargo.toml.drv
  /nix/store/mpgscgqvm7hk75sxl64yikr8x8jmall7-source.drv
  /nix/store/ypczmw2y4xrgxddr1d81nv0a0g5c1rm2-harmonia-deps-3.2.0.drv
  /nix/store/1plj9vxqna9y80ajm524c0yvca5ljpax-harmonia-3.2.0.drv