Function combine::char::string_cmp

pub fn string_cmp<C, I>(s: &'static str, cmp: C) -> StrCmp<C, I> where
    C: FnMut(char, char) -> bool,
    I: Stream<Item = char>,
    I::Error: ParseError<I::Item, I::Range, I::Position>, 

Parses the string s, using cmp to compare each character.

use std::ascii::AsciiExt;
let result = string_cmp("rust", |l, r| l.eq_ignore_ascii_case(&r))
    .parse("RusT")
    .map(|x| x.0);
assert_eq!(result, Ok("rust"));