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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> {}

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