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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. //! Exposes the NonZero lang item which provides optimization hints. use ops::CoerceUnsized; /// A wrapper type for raw pointers and integers that will never be /// NULL or 0 that might allow certain optimizations. #[rustc_layout_scalar_valid_range_start(1)] #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)] #[repr(transparent)] pub(crate) struct NonZero<T>(pub(crate) T); impl<T: CoerceUnsized<U>, U> CoerceUnsized<NonZero<U>> for NonZero<T> {}