parser-combinators

The Display impl for Simple shows raw output and expectations, which is awkward for whitespace, such as '\n':

Example:

use chumsky::primitive::{end, just};
use chumsky::Parser;

type Error = chumsky::error::Simple<char>;

fn main() {
    match parser().then_ignore(end()).parse("\nblah") {
        Ok(_) => panic!("Should not happen."),
        Err(es) => {
            for e 

It would be nice to add the bits of code from chapter 33 of "Programming in Scala" as tests to be sure we don't break compatibility (too much) with the book.