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    // Copyright 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.

    #![unstable(feature = "hashmap_hasher", reason = "hasher stuff is unclear",
                issue = "27713")]
    #![rustc_deprecated(since = "1.7.0", reason = "support moved to std::hash")]
    #![allow(deprecated)]

    use clone::Clone;
    use default::Default;
    use hash;
    use marker;

    pub use hash::HashState;

    /// A structure which is a factory for instances of `Hasher` which implement the
    /// default trait.
    ///
    /// This struct is 0-sized and does not need construction.
    pub struct DefaultState<H>(marker::PhantomData<H>);

    impl<H: Default + hash::Hasher> HashState for DefaultState<H> {
        type Hasher = H;
        fn hasher(&self) -> H { Default::default() }
    }

    impl<H> Clone for DefaultState<H> {
        fn clone(&self) -> DefaultState<H> { DefaultState(marker::PhantomData) }
    }

    impl<H> Default for DefaultState<H> {
        fn default() -> DefaultState<H> { DefaultState(marker::PhantomData) }
    }

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