pub fn not<Input, Output, Error, ParseNext>(
parser: ParseNext,
) -> impl Parser<Input, (), Error>
Expand description
Succeeds if the child parser returns an error.
Note: This does not advance the Stream
§Example
use winnow::combinator::not;
use winnow::ascii::alpha1;
fn parser<'i>(input: &mut &'i str) -> ModalResult<()> {
not(alpha1).parse_next(input)
}
assert_eq!(parser.parse_peek("123"), Ok(("123", ())));
assert!(parser.parse_peek("abcd").is_err());