tokens/src/lib.rs


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//! This package defines the trait for tokenizers that are expected
//! from the parser.
//!
//! This is not the essential part of the package, and users might
//! want to tweak this part.

pub fn add(left: usize, right: usize) -> usize {
    left + right
}

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

    #[test]
    fn it_works() {
        let result = add(2, 2);
        assert_eq!(result, 4);
    }
}