return null;
throw new IllegalStateException("BugInstance must contain at least one class, method, or field annotation");
	public SourceLineAnnotation getPrimarySourceLineAnnotation() {		// Highest priority: return the first top level source line annotation		for (BugAnnotation annotation : annotationList) {			if (annotation instanceof SourceLineAnnotation)				return (SourceLineAnnotation) annotation;		}				// Next: Try primary method, primary field, primary class		SourceLineAnnotation srcLine;		if ((srcLine = inspectPackageMemberSourceLines(getPrimaryMethod())) != null)			return srcLine;		if ((srcLine = inspectPackageMemberSourceLines(getPrimaryField())) != null)			return srcLine;		if ((srcLine = inspectPackageMemberSourceLines(getPrimaryClass())) != null)			return srcLine;				// Last resort: give up and return null.		// This actually should never happen.		return null;	}