these 3 derivations will be built:
  /nix/store/4nxfh5swivj1cb2i5411wl7wpnmsb1ri-anyhow-1.0.104.drv
  /nix/store/fsqsw5vgswmgb9ija8fb2s2frwdny369-cargo-vendor-dir.drv
  /nix/store/ni2b1my59lzc33fc4574qh5h523vb4kq-fast-nix-gc-proptest-0.1.0.drv