[[[link spirit.qi.reference.operator.not_predicate `!a`]]
[`Unused`] [Not predicate. If the predicate `a` matches,
fail. Otherwise, return a zero length match.]]
- [[[link spirit.qi.reference.operator.not_predicate `&a`]]
+ [[[link spirit.qi.reference.operator.and_predicate `&a`]]
[`Unused`] [And predicate. If the predicate `a` matches,
return a zero length match. Otherwise, fail.]]
[[[link spirit.qi.reference.operator.optional `-a`]]