{
  "graph": null,
  "err": {
    "ioerr": null,
    "errs": [
      {
        "range": "d2/testdata/d2compiler/TestCompile/improper-class-ref.d2,0:6:6-0:11:11",
        "errmsg": "d2/testdata/d2compiler/TestCompile/improper-class-ref.d2:1:7: \"class\" must be the last part of the key"
      }
    ]
  }
}