code: public boolean isIncluded(Element e) {
          if (e == null) {
              return false;
          }
          if (includedVisitor == null) {
              includedVisitor = new IncludedVisitor();
          }
          return includedVisitor.visit(e);
      }
docs: Returns true if the given element is included for consideration.
  This method accumulates elements in the cache as enclosed elements of
  fully included elements are tested.
  A member (constructor, method, field) is included if
  - it is visible in a fully included type (--show-members)
  
  @param e the element in question
  
  @see getIncludedModuleElements
  @see getIncludedPackageElements
  @see getIncludedTypeElements
  
  @return true if included