in fatal/type/impl/trie.h [192:206]
void operator ()(
indexed<Match, Index>,
bool &found,
std::size_t const size,
NeedleBegin &&begin,
Visitor &&visitor,
VArgs &&...args
) const {
found = l<1, Filter, Match>::f(
size - 1,
std::next(begin),
static_cast<Visitor &&>(visitor),
static_cast<VArgs &&>(args)...
);
}