ronf 0.4.2

Configuration system with saving
Documentation 
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/// Error to indicate that a conversion between two types is not possible
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct CannotConvert {
    from: String,
    to: String,
}

impl CannotConvert {
    pub fn new(from: &str, to: &str) -> Self {
        CannotConvert {
            from: from.to_string(),
            to: to.to_string(),
        }
    }
}

impl std::fmt::Display for CannotConvert {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "Cannot convert {} to {}", self.from, self.to)
    }
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_cannot_convert_display() {
        let error = CannotConvert::new("String", "Int");
        assert_eq!(error.to_string(), "Cannot convert String to Int");
    }
}