skillet 0.6.0

Skillet: micro expression language (arithmetic, logical, functions, arrays, conditionals, excel formulas) made in Rust bin cli and server
Documentation 
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use std::fmt::{Display, Formatter};

#[derive(Debug, Clone, PartialEq)]
pub struct Error {
    pub message: String,
    pub position: Option<usize>,
}

impl Error {
    pub fn new<M: Into<String>>(message: M, position: Option<usize>) -> Self {
        Self {
            message: message.into(),
            position,
        }
    }
}

impl Display for Error {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self.position {
            Some(pos) => write!(f, "{} at position {}", self.message, pos),
            None => write!(f, "{}", self.message),
        }
    }
}

impl std::error::Error for Error {}