if len(s.parseState) <= maxNestingDepth {
		return successState
	}
	return s.error(c, "exceeded max depth")
}

// popParseState pops a parse state (already obtained) off the stack
// and updates s.step accordingly.
func (s *scanner) popParseState() {
	n := len(s.parseState) - 1
	s.parseState = s.parseState[0:n]
	if n == 0 {
		s.step = stateEndTop
		s.endTop = true
	} else {