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    //! Macros to ease conditional code based on enabled features.

    // Depending on the features not all macros are used.
    #![allow(unused_macros)]

    /// The `os-poll` feature is enabled.
    macro_rules! cfg_os_poll {
        ($($item:item)*) => {
            $(
                #[cfg(feature = "os-poll")]
                #[cfg_attr(docsrs, doc(cfg(feature = "os-poll")))]
                $item
            )*
        }
    }

    /// The `os-poll` feature is disabled.
    macro_rules! cfg_not_os_poll {
        ($($item:item)*) => {
            $(
                #[cfg(not(feature = "os-poll"))]
                $item
            )*
        }
    }

    /// The `os-ext` feature is enabled.
    macro_rules! cfg_os_ext {
        ($($item:item)*) => {
            $(
                #[cfg(feature = "os-ext")]
                #[cfg_attr(docsrs, doc(cfg(feature = "os-ext")))]
                $item
            )*
        }
    }

    /// The `net` feature is enabled.
    macro_rules! cfg_net {
        ($($item:item)*) => {
            $(
                #[cfg(feature = "net")]
                #[cfg_attr(docsrs, doc(cfg(feature = "net")))]
                $item
            )*
        }
    }

    /// One of the features enabled that needs `IoSource`. That is `net` or `os-ext`
    /// on Unix (for `pipe`).
    macro_rules! cfg_io_source {
        ($($item:item)*) => {
            $(
                #[cfg(any(feature = "net", all(unix, feature = "os-ext")))]
                #[cfg_attr(docsrs, doc(any(feature = "net", all(unix, feature = "os-ext"))))]
                $item
            )*
        }
    }

    /// The `os-ext` feature is enabled, or one of the features that need `os-ext`.
    macro_rules! cfg_any_os_ext {
        ($($item:item)*) => {
            $(
                #[cfg(any(feature = "os-ext", feature = "net"))]
                #[cfg_attr(docsrs, doc(cfg(any(feature = "os-ext", feature = "net"))))]
                $item
            )*
        }
    }