these 4 derivations will be built:
  /nix/store/8qkljzsxqx1qxygbbsn5wdp008danxmv-crate-serde_json-1.0.154.tar.gz.drv
  /nix/store/w09smak988y8wa4jbzyg5h922zsqflmz-serde_json-1.0.154.drv
  /nix/store/sw0j3k23zqraiy588vv3j2yc1axbrwx7-cargo-vendor-dir.drv
  /nix/store/q48g01xrd7lgh37c6kc5cqdw2gd37rxq-nix-tree-0.1.0.drv