use combine::{
     many1,
     parser::char::{letter, space},
     sep_by, Parser,
 };
 
 #[test]
readme() fn readme() {
     main();
 }
 
main() fn main() {
     let word = many1(letter());
 
     let mut parser = sep_by(word, space()).map(|mut words: Vec<String>| words.pop());
     let result = parser.parse("Pick up that word!");
     assert_eq!(result, Ok((Some("word".to_string()), "!")));
 }