{
  "errors": [
    {
      "message": "Fragment \"C\" is never used.",
      "locations": [
        {
          "line": 16,
          "column": 10
        }
      ]
    },
    {
      "message": "Fragment \"D\" is never used.",
      "locations": [
        {
          "line": 20,
          "column": 10
        }
      ]
    }
  ]
}