Function ruststep::parser::combinator::opt_ [−][src]
pub fn opt_<'a, O>(
f: impl ExchangeParser<'a, O>
) -> impl ExchangeParser<'a, Option<O>>
pub fn opt_<'a, O>(
f: impl ExchangeParser<'a, O>
) -> impl ExchangeParser<'a, Option<O>>