fragment VideoFields on Video { duration }

# @genqlient(struct: true)
query StructOption {
  root {
    id
    children {
      id
      parent {
        id
        children {
          id
        }
        # (it won't apply to this)
        interfaceChildren: children {
          id
          ...VideoFields
        }
      }
    }
  }
  # (nor this)
  user { roles }
}