docs: private static ConjunctionImpl simpleConjunct(Selector tree) {
      if (tree.getNumIds() == 0)
      {
        Boolean theEval = (Boolean) Matching.getEvaluator().eval(tree);
        if (theEval != null && theEval.booleanValue()) // was ((BooleanValue) Matching.getEvaluator().eval(tree)).booleanValue()    	
          return new ConjunctionImpl();
        else
          return null;
      }
      else if (Matching.isSimple(tree))
      {
          if(tree.isExtended())
            return new ConjunctionImpl(new ExtendedSimpleTestImpl(tree));
          else
     	      return new ConjunctionImpl(new SimpleTestImpl(tree));
      }
      else
        return new ConjunctionImpl(tree);
    }