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    use crate::io::{self, IoSlice, IoSliceMut};
    use crate::mem::ManuallyDrop;
    use crate::sys::fd::FileDesc;

    pub struct Stdin(());
    pub struct Stdout(());
    pub struct Stderr(());

    impl Stdin {
        pub fn new() -> io::Result<Stdin> {
            Ok(Stdin(()))
        }
    }

    impl io::Read for Stdin {
        fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
            ManuallyDrop::new(FileDesc::new(libc::STDIN_FILENO)).read(buf)
        }

        fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
            ManuallyDrop::new(FileDesc::new(libc::STDIN_FILENO)).read_vectored(bufs)
        }
    }

    impl Stdout {
        pub fn new() -> io::Result<Stdout> {
            Ok(Stdout(()))
        }
    }

    impl io::Write for Stdout {
        fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
            ManuallyDrop::new(FileDesc::new(libc::STDOUT_FILENO)).write(buf)
        }

        fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
            ManuallyDrop::new(FileDesc::new(libc::STDOUT_FILENO)).write_vectored(bufs)
        }

        fn flush(&mut self) -> io::Result<()> {
            Ok(())
        }
    }

    impl Stderr {
        pub fn new() -> io::Result<Stderr> {
            Ok(Stderr(()))
        }
    }

    impl io::Write for Stderr {
        fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
            ManuallyDrop::new(FileDesc::new(libc::STDERR_FILENO)).write(buf)
        }

        fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
            ManuallyDrop::new(FileDesc::new(libc::STDERR_FILENO)).write_vectored(bufs)
        }

        fn flush(&mut self) -> io::Result<()> {
            Ok(())
        }
    }

    pub fn is_ebadf(err: &io::Error) -> bool {
        err.raw_os_error() == Some(libc::EBADF as i32)
    }

    pub const STDIN_BUF_SIZE: usize = crate::sys_common::io::DEFAULT_BUF_SIZE;

    pub fn panic_output() -> Option<impl io::Write> {
        Stderr::new().ok()
    }