these 2 derivations will be built:
  /nix/store/psmzklfzpsycl3wgfzizhaz36arpfch3-source.drv
  /nix/store/pjnlqcnms8777rz0v4yvvv9cncf8lfjp-structty-0.1.2.drv
error: hash mismatch in fixed-output derivation '/nix/store/2m8xhi5gf56pqzd7ns9z9csn8svim72z-source.drv':
         specified: sha256-b8jNd8uUcZl0+NWrNkD7p2Q+PEupWP8VNzJf14/hhVc=
            got:    sha256-2KVpOQ2ufGCOD2IFvfbLsE5oy56MV/xKIVl82e7vLeM=
error: build of resolved derivation '/nix/store/2m8xhi5gf56pqzd7ns9z9csn8svim72z-source.drv' failed
error: Cannot build '/nix/store/pjnlqcnms8777rz0v4yvvv9cncf8lfjp-structty-0.1.2.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/kpk21i15q38i0ln2avgiscxcpn4f447q-structty-0.1.2