nixpkgs/pkgs/development/compilers/matter-compiler/gemset.nix

{
  matter_compiler = {
    groups = ["default"];
    platforms = [];
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "16501zdiqxk34v2d0nlbwrcrjm6g57hrsmsw0crwssn29v5zbykf";
      type = "gem";
    };
    version = "0.5.1";
  };
}