assert_exists

monch

Function assert_exists 

Source 
pub fn assert_exists<'a, O>(
    combinator: impl Fn(&'a str) -> ParseResult<'a, O>,
    message: &'static str,
) -> impl Fn(&'a str) -> ParseResult<'a, O>
Expand description

Asserts that a combinator resolves. If backtracing occurs, returns a failure.