sum parser

extern crate "parser-combinators" as parser;

use parser::{Parser, ParserExt};

fn main() {
	let good_test = "2 + 12 + 22";

	let integer = parser::spaces().with(
			parser::chars1(parser::digit()).map(|s| s.parse::<i32>().unwrap())
		);

	let plus = parser::spaces().with(parser::string("+"));

	let mut sum = parser::chainl1(integer, plus.map(|str| 
		Box::new(|&mut: a:i32, b:i32| {a + b}) as Box<FnMut(i32,i32) -> i32>
	));

	match sum.parse(good_test) {
		Ok((value, _)) => println!("Good! {}", value),
		Err(err) => println!("{}", err)
	};
}