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    #![allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411

    cfg_io_util! {
        mod async_buf_read_ext;
        pub use async_buf_read_ext::AsyncBufReadExt;

        mod async_read_ext;
        pub use async_read_ext::AsyncReadExt;

        mod async_seek_ext;
        pub use async_seek_ext::AsyncSeekExt;

        mod async_write_ext;
        pub use async_write_ext::AsyncWriteExt;

        mod buf_reader;
        pub use buf_reader::BufReader;

        mod buf_stream;
        pub use buf_stream::BufStream;

        mod buf_writer;
        pub use buf_writer::BufWriter;

        mod chain;

        mod copy;
        pub use copy::copy;

        mod copy_buf;
        pub use copy_buf::copy_buf;

        mod empty;
        pub use empty::{empty, Empty};

        mod flush;

        mod lines;
        pub use lines::Lines;

        mod mem;
        pub use mem::{duplex, DuplexStream};

        mod read;
        mod read_buf;
        mod read_exact;
        mod read_int;
        mod read_line;

        mod read_to_end;
        mod vec_with_initialized;
        cfg_process! {
            pub(crate) use read_to_end::read_to_end;
        }

        mod read_to_string;
        mod read_until;

        mod repeat;
        pub use repeat::{repeat, Repeat};

        mod shutdown;

        mod sink;
        pub use sink::{sink, Sink};

        mod split;
        pub use split::Split;

        mod take;
        pub use take::Take;

        mod write;
        mod write_all;
        mod write_buf;
        mod write_int;

        // used by `BufReader` and `BufWriter`
        // https://github.com/rust-lang/rust/blob/master/library/std/src/sys_common/io.rs#L1
        const DEFAULT_BUF_SIZE: usize = 8 * 1024;
    }

    cfg_not_io_util! {
        cfg_process! {
            mod vec_with_initialized;
            mod read_to_end;
            // Used by process
            pub(crate) use read_to_end::read_to_end;
        }
    }