nixpkgs/pkgs/development/libraries/haskell/utf8-string/default.nix

{cabal}:

cabal.mkDerivation (self : {
  pname = "utf8-string";
  version = "0.3.6";
  sha256 = "c8c74555174edfb96145585c9b80780d0fc55ba249282b8a4c5968cca7c09d69";
  meta = {
    description = "A UTF8 layer for IO and Strings";
  };
})