rugs 0.0.1

A WIP Haskell implementation
Documentation 
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use std::fmt::Display;

#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Location {
    Offset { start: usize, end: usize },
    Unlocated,
}

#[derive(Debug, Clone, PartialEq)]
pub struct FileLocation {
    file: String,
    start: (usize, usize),
    end: (usize, usize),
}

impl Display for Location {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Location::Offset { start, end } => {
                write!(f, "offset {}-{}", start, end)?;
                Ok(())
            }
            Location::Unlocated => {
                write!(f, "unknown location")?;
                Ok(())
            }
        }
    }
}

impl Display for FileLocation {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        if self.start.0 == self.end.0 {
            write!(
                f,
                "file {}: line {}:{}-{}",
                self.file, self.start.0, self.start.1, self.end.1
            )?;
        } else {
            write!(
                f,
                "file {}: lines {}:{}-{}:{}",
                self.file, self.start.0, self.start.1, self.end.0, self.end.1
            )?;
        }
        Ok(())
    }
}