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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.

    mod node;
    mod search;
    pub mod map;
    pub mod set;

    #[doc(hidden)]
    trait Recover<Q: ?Sized> {
        type Key;

        fn get(&self, key: &Q) -> Option<&Self::Key>;
        fn take(&mut self, key: &Q) -> Option<Self::Key>;
        fn replace(&mut self, key: Self::Key) -> Option<Self::Key>;
    }

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