assert

monch

Function assert 

Source 
pub fn assert<'a, O>(
    combinator: impl Fn(&'a str) -> ParseResult<'a, O>,
    condition: impl Fn(Result<&(&'a str, O), &ParseError<'a>>) -> bool,
    message: &'static str,
) -> impl Fn(&'a str) -> ParseResult<'a, O>
Expand description

Asserts that a given condition is true about the combinator. Otherwise returns an error with the message.