these 4 derivations will be built:
  /nix/store/csdzx7si06z0b5nmm0dpnprw2z0cn52y-crate-tokio-1.53.1.tar.gz.drv
  /nix/store/k0372is5a68i6y09bkz9nlg11l2l78m4-tokio-1.53.1.drv
  /nix/store/ba2h5ky4d7chyinj09li3xaddy8whzx9-cargo-vendor-dir.drv
  /nix/store/78ypkdfzwc1vlyvgi3cnnmdljxkx1hr1-fast-nix-gc-proptest-0.1.0.drv