void add(BugAnnotation annotation) {
public BugInstance add(BugAnnotation annotation) {
	void add(BugAnnotation annotation) {		if (annotation == null)			throw new IllegalStateException("Missing BugAnnotation!");		// Add to list		annotationList.add(annotation);		// This object is being modified, so the cached hashcode		// must be invalidated		cachedHashCode = INVALID_HASH_CODE;	}