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

{
  "matter_compiler" = {
    version = "0.5.1";
    source = {
      type = "gem";
      sha256 = "16501zdiqxk34v2d0nlbwrcrjm6g57hrsmsw0crwssn29v5zbykf";
    };
  };
}