{
  "graph": null,
  "err": {
    "errs": [
      {
        "range": "d2/testdata/d2compiler/TestCompile2/vars/override/nested-null.d2,12:2:102-12:4:104",
        "errmsg": "d2/testdata/d2compiler/TestCompile2/vars/override/nested-null.d2:13:3: could not resolve variable \"surname\""
      }
    ]
  }
}