fClassifyAsExcludable = function() {
           if (oSourceElementData.nCategory ===
               ESourceElementCategories.N_OTHER) {
             oSourceElementData.nCategory =
                 ESourceElementCategories.N_EXCLUDABLE;
           }
         }
Classifies the source element as excludable if it does not
contain a {@code with} statement or the {@code eval} identifier
name.