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use core::fmt::Debug;

/// A device.
pub trait Device {
    type Error: Debug;

    /// Reads from standard input.
    fn read(&mut self) -> Result<Option<u8>, Self::Error>;
    /// Writes to standard output.
    fn write(&mut self, byte: u8) -> Result<(), Self::Error>;
    /// Writes to standard error.
    fn write_error(&mut self, byte: u8) -> Result<(), Self::Error>;
}