docs: private void accumulateFunctionBinding( AccumulateDescrBuilder< ? > accumulate ) throws RecognitionException {
          String label = null;
          boolean unif = false;
          if (input.LA(2) == DRL6Lexer.COLON) {
              label = label(DroolsEditorType.IDENTIFIER_VARIABLE);
          } else if (input.LA(2) == DRL6Lexer.UNIFY) {
              label = unif(DroolsEditorType.IDENTIFIER_VARIABLE);
              unif = true;
          }
          accumulateFunction( accumulate,
                              unif,
                              label );
      }