The repo is not compatible with purescript-lua/develop

[Renegatto]

An attempt to use develop by specifying
pslua.url = "github:Unisay/purescript-lua?rev=c959c98c434ede07f9d9d98a7d84e0854d1efbde";
leads to the following error

warning: Git tree '/home/user/purescript-lua-template' is dirty
trace: WARNING: No sha256 found for source-repository-package https://github.com/Unisay/purescript-corefn ref=HEAD rev=(unspecified) download may fail in restricted mode (hydra)
error:
       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'nix-shell'
         whose name attribute is located at /nix/store/cc0ribc27c349w1v2anrby7z8kigy5pq-source/pkgs/stdenv/generic/make-derivation.nix:331:7

Most likely because of the changes in c959c98c434ede07f9d9d98a7d84e0854d1efbde.