nixpkgs/pkgs/development/tools/misc/watson-ruby/gemset.nix

{
  json = {
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "01v6jjpvh3gnq6sgllpfqahlgxzj50ailwhj9b3cd20hi2dx0vxp";
      type = "gem";
    };
    version = "2.1.0";
  };
  watson-ruby = {
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "1d5m29nr0i030q8ygmbapwri5ndcg2q6lf8a15bk79lfcp9xyj9w";
      type = "gem";
    };
    version = "1.6.3";
  };
}