RecursivelyFindLeaves(field->second);
        current_index_path_.pop_back();
      }
      return;
    }
    case StructuredValue::kTupleValue: {
      const TupleValue& tuple = value.tuple_value();
      for (int i = 0, e = tuple.values_size(); i < e; i++) {
        current_index_path_.push_back(builder_.getI64IntegerAttr(i));
        RecursivelyFindLeaves(tuple.values(i));

      Parameter(&xla_builder, 0, ShapeUtil::MakeScalarShape(xla::F32), "a");

  XlaOp add = xla::Add(param, xla::ConstantR0<float>(&xla_builder, 2.0));

  std::vector<XlaOp> tuple_values;
  tuple_values.push_back(add);

  xla::Tuple(&xla_builder, tuple_values);
  return xla_builder.Build().value();
}

class EmptyPatternRewriter : public mlir::PatternRewriter {
 public:
  explicit EmptyPatternRewriter(const OpBuilder& other_builder)