if pos != p.cachedPos {
		p.cachedPos = pos
		p.cachedLine = p.fset.PositionFor(pos, false /* absolute position */).Line
	}
	return p.cachedLine
}

// writeLineDirective writes a //line directive if necessary.
func (p *printer) writeLineDirective(pos token.Position) {
	if pos.IsValid() && (p.out.Line != pos.Line || p.out.Filename != pos.Filename) {
		if strings.ContainsAny(pos.Filename, "\r\n") {
			if p.sourcePosErr == nil {