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    macro_rules! cfg_codec {
        ($($item:item)*) => {
            $(
                #[cfg(feature = "codec")]
                #[cfg_attr(docsrs, doc(cfg(feature = "codec")))]
                $item
            )*
        }
    }

    macro_rules! cfg_compat {
        ($($item:item)*) => {
            $(
                #[cfg(feature = "compat")]
                #[cfg_attr(docsrs, doc(cfg(feature = "compat")))]
                $item
            )*
        }
    }

    macro_rules! cfg_net {
        ($($item:item)*) => {
            $(
                #[cfg(all(feature = "net", feature = "codec"))]
                #[cfg_attr(docsrs, doc(cfg(all(feature = "net", feature = "codec"))))]
                $item
            )*
        }
    }

    macro_rules! cfg_io {
        ($($item:item)*) => {
            $(
                #[cfg(feature = "io")]
                #[cfg_attr(docsrs, doc(cfg(feature = "io")))]
                $item
            )*
        }
    }

    macro_rules! cfg_rt {
        ($($item:item)*) => {
            $(
                #[cfg(feature = "rt")]
                #[cfg_attr(docsrs, doc(cfg(feature = "rt")))]
                $item
            )*
        }
    }