docs: protected void checkBugInstance(BugInstance bugInstance) {
          for (Iterator<BugAnnotation> i = bugInstance.annotationIterator(); i.hasNext();) {
              BugAnnotation bugAnnotation = i.next();
              if (bugAnnotation instanceof PackageMemberAnnotation) {
                  PackageMemberAnnotation pkgMember = (PackageMemberAnnotation) bugAnnotation;
                  if (pkgMember.getSourceLines() == null) {
                      throw new IllegalStateException("Package member " + pkgMember + " reported without source lines!");
                  }
              }
          }
      }