this derivation will be built:
  /nix/store/kk0i0wqrm09lkg5zv63mcsp1qh1ij563-treefmt-check.drv
building '/nix/store/kk0i0wqrm09lkg5zv63mcsp1qh1ij563-treefmt-check.drv'
treefmt-check> tribuchet: building on jamie