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    //! 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, and initial support for Redox.
    //!
    //! The centralization of platform-specific code in this module is
    //! enforced by the "platform abstraction layer" tidy script in
    //! `tools/tidy/src/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)]

    cfg_if::cfg_if! {
        if #[cfg(target_os = "vxworks")] {
            mod vxworks;
            pub use self::vxworks::*;
        } else if #[cfg(unix)] {
            mod unix;
            pub use self::unix::*;
        } else if #[cfg(windows)] {
            mod windows;
            pub use self::windows::*;
        } else if #[cfg(target_os = "cloudabi")] {
            mod cloudabi;
            pub use self::cloudabi::*;
        } else if #[cfg(target_os = "hermit")] {
            mod hermit;
            pub use self::hermit::*;
        } else if #[cfg(target_os = "wasi")] {
            mod wasi;
            pub use self::wasi::*;
        } else if #[cfg(target_arch = "wasm32")] {
            mod wasm;
            pub use self::wasm::*;
        } else if #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))] {
            mod sgx;
            pub use self::sgx::*;
        } else {
            compile_error!("libstd doesn't compile for this platform yet");
        }
    }

    // Import essential modules from both platforms when documenting. These are
    // then later used in the `std::os` module when documenting, for example,
    // Windows when we're compiling for Linux.

    #[cfg(doc)]
    cfg_if::cfg_if! {
        if #[cfg(unix)] {
            // On unix we'll document what's already available
            #[stable(feature = "rust1", since = "1.0.0")]
            pub use self::ext as unix_ext;
        } else if #[cfg(any(target_os = "cloudabi",
                            target_os = "hermit",
                            target_arch = "wasm32",
                            all(target_vendor = "fortanix", target_env = "sgx")))] {
            // On CloudABI and wasm right now the module below doesn't compile
            // (missing things in `libc` which is empty) so just omit everything
            // with an empty module
            #[unstable(issue = "0", feature = "std_internals")]
            #[allow(missing_docs)]
            pub mod unix_ext {}
        } else {
            // On other platforms like Windows document the bare bones of unix
            use crate::os::linux as platform;
            #[path = "unix/ext/mod.rs"]
            pub mod unix_ext;
        }
    }

    #[cfg(doc)]
    cfg_if::cfg_if! {
        if #[cfg(windows)] {
            // On windows we'll just be documenting what's already available
            #[allow(missing_docs)]
            #[stable(feature = "rust1", since = "1.0.0")]
            pub use self::ext as windows_ext;
        } else if #[cfg(any(target_os = "cloudabi",
                            target_arch = "wasm32",
                            all(target_vendor = "fortanix", target_env = "sgx")))] {
            // On CloudABI and wasm right now the shim below doesn't compile, so
            // just omit it
            #[unstable(issue = "0", feature = "std_internals")]
            #[allow(missing_docs)]
            pub mod windows_ext {}
        } else {
            // On all other platforms (aka linux/osx/etc) then pull in a "minimal"
            // amount of windows goop which ends up compiling
            #[macro_use]
            #[path = "windows/compat.rs"]
            mod compat;

            #[path = "windows/c.rs"]
            mod c;

            #[path = "windows/ext/mod.rs"]
            pub mod windows_ext;
        }
    }