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#[derive(thiserror::Error, Debug, Eq, PartialEq, Clone)]
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pub enum RequestError {
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    #[error("datagram too short")]
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    TooShort,
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    #[error("bad op code ({})", {0})]
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    BadOpCode(u16),
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    #[error("filename missing")]
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    MissingFilename,
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    #[error("mode missing")]
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    MissingMode,
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    #[error("unsupported mode")]
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    BadMode,
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    #[error("not a digit ({})", {0})]
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    BadDigit(u8),
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    #[error("number out of range")]
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    NumberOutOfRange,
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    #[error("missing argument")]
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    MissingArgument,
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    #[error("datagram without trailing zero")]
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    MissingZero,
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    #[error("write operation not implemented")]
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    WriteUnsupported,
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    #[error("operation not supported")]
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    OperationUnsupported,
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}
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pub type RequestResult<T> = std::result::Result<T, RequestError>;