these 2 derivations will be built:
  /nix/store/9isj5zybnimkrshdaqywygh6v5insrgw-gastown-1.2.1.drv
  /nix/store/ga5vb9fw5yl39f985g4g1zqqm5h8b9v5-check-gastown.drv
this path will be fetched (22.5 MiB download, 54.0 MiB unpacked):
  /nix/store/hm6ihawx1sk1jpsdzb2i4psy2v5p1mhy-git-minimal-2.55.0