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    //! OS-specific functionality.

    #![stable(feature = "os", since = "1.0.0")]
    #![allow(missing_docs, nonstandard_style, missing_debug_implementations)]

    cfg_if::cfg_if! {
        if #[cfg(doc)] {

            // When documenting libstd we want to show unix/windows/linux modules as
            // these are the "main modules" that are used across platforms. This
            // should help show platform-specific functionality in a hopefully
            // cross-platform way in the documentation

            #[stable(feature = "rust1", since = "1.0.0")]
            pub use crate::sys::unix_ext as unix;

            #[stable(feature = "rust1", since = "1.0.0")]
            pub use crate::sys::windows_ext as windows;

            #[doc(cfg(target_os = "linux"))]
            pub mod linux;
        } else {

            // If we're not documenting libstd then we just expose the main modules
            // as we otherwise would.

            #[cfg(any(target_os = "redox", unix, target_os = "vxworks", target_os = "hermit"))]
            #[stable(feature = "rust1", since = "1.0.0")]
            pub use crate::sys::ext as unix;

            #[cfg(windows)]
            #[stable(feature = "rust1", since = "1.0.0")]
            pub use crate::sys::ext as windows;

            #[cfg(any(target_os = "linux", target_os = "l4re"))]
            pub mod linux;

        }
    }

    #[cfg(target_os = "android")]
    pub mod android;
    #[cfg(target_os = "dragonfly")]
    pub mod dragonfly;
    #[cfg(target_os = "emscripten")]
    pub mod emscripten;
    #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
    pub mod fortanix_sgx;
    #[cfg(target_os = "freebsd")]
    pub mod freebsd;
    #[cfg(target_os = "fuchsia")]
    pub mod fuchsia;
    #[cfg(target_os = "haiku")]
    pub mod haiku;
    #[cfg(target_os = "illumos")]
    pub mod illumos;
    #[cfg(target_os = "ios")]
    pub mod ios;
    #[cfg(target_os = "macos")]
    pub mod macos;
    #[cfg(target_os = "netbsd")]
    pub mod netbsd;
    #[cfg(target_os = "openbsd")]
    pub mod openbsd;
    #[cfg(target_os = "redox")]
    pub mod redox;
    #[cfg(target_os = "solaris")]
    pub mod solaris;
    #[cfg(target_os = "vxworks")]
    pub mod vxworks;
    #[cfg(target_os = "wasi")]
    pub mod wasi;

    pub mod raw;