const maxNestLev int = 1e5

func incNestLev(p *parser) *parser {
	p.nestLev++
	if p.nestLev > maxNestLev {
		p.error(p.pos, "exceeded max nesting depth")
		panic(bailout{})
	}
	return p
}

// decNestLev is used to track nesting depth during parsing to prevent stack exhaustion.
// It is used along with incNestLev in a similar fashion to how un and trace are used.