code: private void mergeItem(final Set<String> supers, final Set<SourceLineAnnotation> sla, final OpcodeStack.Item addItm) throws ClassNotFoundException {
  
          if (supers.isEmpty()) {
              return;
          }
  
          Set<String> s = new HashSet<>();
          addNewItem(s, addItm);
  
          if (s.isEmpty()) {
              return;
          }
  
          intersection(supers, s);
  
          if (supers.isEmpty()) {
              BugInstance bug = new BugInstance(this, BugType.UCC_UNRELATED_COLLECTION_CONTENTS.name(), NORMAL_PRIORITY).addClass(this);
  
              if (addItm.getRegisterNumber() != -1) {
                  bug.addMethod(this);
              }
  
              for (SourceLineAnnotation a : sla) {
                  bug.addSourceLine(a);
              }
  
              bugReporter.reportBug(bug);
          }
      }
docs: intersects the set of possible superclass that this collection might have seen before with this one. If we find that there is no commonality between
  superclasses, report it as a bug.
  
  @param supers
  the collection of possible superclass/interfaces that has been seen for this collection thus far
  @param sla
  the location of this add
  @param addItm
  the currently added item
  @throws ClassNotFoundException
  if a superclass/interface can not be found