these 2 derivations will be built:
  /nix/store/g7vfb2wj8nbj9nk5m52m2q9kabshn31l-source.drv
  /nix/store/cj02frggixcxib1sqra2z8yc0pfi1pmi-structty-0.1.2.drv
error: hash mismatch in fixed-output derivation '/nix/store/k48b1yvczc7my6k506pxdxnl3jcj5qpj-source.drv':
         specified: sha256-b8jNd8uUcZl0+NWrNkD7p2Q+PEupWP8VNzJf14/hhVc=
            got:    sha256-2KVpOQ2ufGCOD2IFvfbLsE5oy56MV/xKIVl82e7vLeM=
error: build of resolved derivation '/nix/store/k48b1yvczc7my6k506pxdxnl3jcj5qpj-source.drv' failed
error: Cannot build '/nix/store/cj02frggixcxib1sqra2z8yc0pfi1pmi-structty-0.1.2.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/y8bjafgvvjsr1vf1297nskj24wrwrg1s-structty-0.1.2