// Copyright (c) Meta Platforms, Inc. and affiliates.
//
// This source code is licensed under both the MIT license found in the
// LICENSE-MIT file in the root directory of this source tree and the Apache
// License, Version 2.0 found in the LICENSE-APACHE file in the root directory
// of this source tree.
//! Helper structs that are used for various data structures,
//! to make it easier to pass arguments around.
use crate Digest;
use crate::;
/// Root hash of the tree and its associated epoch
;
/// Info needed for a lookup of a user for an epoch