addFormElement(child, indexToInsertAt) {
      this._throwWhenInvalidChildModelValue(child);
      // eslint-disable-next-line no-param-reassign
      child.name = this.name;
      super.addFormElement(child, indexToInsertAt);
    }
@enhance FormRegistrarMixin
@param {FormControl} child
@param {number} indexToInsertAt