Function combine::satisfy
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pub fn satisfy<I, P>(predicate: P) -> Satisfy<I, P> where I: Stream, P: FnMut(I::Item) -> bool
Parses a token and succeeds depending on the result of predicate
let mut parser = satisfy(|c| c == '!' || c == '?'); assert_eq!(parser.parse("!").map(|x| x.0), Ok('!')); assert_eq!(parser.parse("?").map(|x| x.0), Ok('?'));