Function chomp::parsers::satisfy

pub fn satisfy<I: Input, F>(i: I, f: F) -> SimpleResult<I, I::Token> where
    F: FnOnce(I::Token) -> bool, 

Matches an item using f, the item is returned if f yields true, otherwise this parser fails.

If the buffer length is 0 this parser is considered incomplete.

use chomp::prelude::{parse_only, satisfy};

assert_eq!(parse_only(|i| satisfy(i, |c| c == b'a'), b"abc"), Ok(b'a'));