pub enum Outcome {
    Warning(Warning),
    Error(Error),
}

impl<T> From<T> for Outcome where Warning: From<T> {
    fn from(warn: T) -> Self {
        Self::Warning(warn.into())
    }
}

impl<T> From<T> for Outcome where Error: From<T> {
    fn from(err: T) -> Self {
        Self::Error(err.into())
    }
}

pub enum Warning {
    Warning1,
    // some other cases
}

// some implementations of From<T> for Warning

pub enum Error {
    Error1,
    // some other cases
}

// some implementations of From<T> for Error