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/// Used by the [`Router`] to modify the type of the [`RouterInner`] and return
/// a new [`Router`].
///
/// [`Router`]: crate::Router
/// [`RouterInner`]: crate::router::RouterInner
/// Used by the [`Router`] to access methods on the [`RouterInner`] without
/// modifying the inner type.
///
/// [`Router`]: crate::Router
/// [`RouterInner`]: crate::router::RouterInner
/// Unwrap a result, panic with the `Display` of the error if it is an `Err`.
/// Unwrap a result contianing an `Infallible`.
// used in some features
// Some code is this file is reproduced under the terms of the MIT license. It
// originates from the `axum` crate. The original source code can be found at
// the following URL, and the original license is included below.
//
// https://github.com/tokio-rs/axum/blob/f84105ae8b078109987b089c47febc3b544e6b80/axum/src/routing/mod.rs#L119
//
// The MIT License (MIT)
//
// Copyright (c) 2019 Axum Contributors
//
// Permission is hereby granted, free of charge, to any
// person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the
// Software without restriction, including without
// limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice
// shall be included in all copies or substantial portions
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.