infinisil: i have an error while calling
nix-instantiate -E 'with import ./. {}; haskellPackages.callHackage "hnix" "0.6.0" {}'
tar: */hnix/0.6.0/hnix.json: Not found in archive
tar: */hnix/0.6.0/hnix.cabal: Not found in archive