docs: public static Optional<ParserRuleContext> findFirstChildNodeNoneRecursive(final ParserRuleContext node, final RuleName ruleName) {
          if (isMatchedNode(node, ruleName)) {
              return Optional.of(node);
          }
          for (int i = 0; i < node.getChildCount(); i++) {
              if (node.getChild(i) instanceof ParserRuleContext) {
                  ParserRuleContext child = (ParserRuleContext) node.getChild(i);
                  if (isMatchedNode(child, ruleName)) {
                      return Optional.of(child);
                  }
              }
          }
          return Optional.absent();
      }