public BugInstance addSourceLineRange(BetterVisitor visitor, int startPC, int endPC) {
public BugInstance addSourceLineRange(PreorderVisitor visitor, int startPC, int endPC) {
	public BugInstance addSourceLineRange(BetterVisitor visitor, int startPC, int endPC) {		SourceLineAnnotation sourceLineAnnotation = SourceLineAnnotation.fromVisitedInstructionRange(visitor, startPC, endPC);		if (sourceLineAnnotation != null)			add(sourceLineAnnotation);		return this;	}