return p.index
}

func (p XPos) LineNumberHTML() string {
	if !p.IsKnown() {
		return "?"
	}
	return p.lico.lineNumberHTML()
}

// AtColumn1 returns the same location but shifted to column 1.
func (p XPos) AtColumn1() XPos {
	p.lico = p.lico.atColumn1()
	return p
}

// A PosTable tracks Pos -> XPos conversions and vice versa.
// Its zero value is a ready-to-use PosTable.
type PosTable struct {