docs: public int getSameNameSiblingIndex() {
          int snsIndex = 1;
          if (this.parent == null) {
              return snsIndex;
          }
          // Go through all the children ...
          for (AstNode sibling : this.parent.getChildren()) {
              if (sibling == this) {
                  break;
              }
              if (sibling.getName().equals(this.name)) {
                  ++snsIndex;
              }
          }
          return snsIndex;
      }