nixpkgs/pkgs/development/tools/amqpcat/shards.nix

{
  amq-protocol = {
    url = "https://github.com/cloudamqp/amq-protocol.cr.git";
    rev = "v0.3.24";
    sha256 = "011xia60wkmbjsk8j4qnswx0lg1i7vrchjwnxlksjv3npp2z98a3";
  };
  amqp-client = {
    url = "https://github.com/cloudamqp/amqp-client.cr.git";
    rev = "v0.6.2";
    sha256 = "0h9c2v7ks776msm3dn2d68y85i6mm4gm5s3jlrs8dlp36kndkplc";
  };
}