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    // Copyright 2016 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.

    //! Platform-dependent platform abstraction
    //!
    //! The `std::sys` module is the abstracted interface through which
    //! `std` talks to the underlying operating system. It has different
    //! implementations for different operating system families, today
    //! just Unix and Windows.
    //!
    //! The centralization of platform-specific code in this module is
    //! enforced by the "platform abstraction layer" tidy script in
    //! `tools/tidy/pal.rs`.
    //!
    //! This module is closely related to the platform-independent system
    //! integration code in `std::sys_common`. See that module's
    //! documentation for details.
    //!
    //! In the future it would be desirable for the independent
    //! implementations of this module to be extracted to their own crates
    //! that `std` can link to, thus enabling their implementation
    //! out-of-tree via crate replacement. Though due to the complex
    //! inter-dependencies within `std` that will be a challenging goal to
    //! achieve.

    #![allow(missing_debug_implementations)]

    pub use self::imp::*;

    #[cfg(target_os = "redox")]
    #[path = "redox/mod.rs"]
    mod imp;

    #[cfg(unix)]
    #[path = "unix/mod.rs"]
    mod imp;

    #[cfg(windows)]
    #[path = "windows/mod.rs"]
    mod imp;

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