{
  "graph": null,
  "err": {
    "errs": [
      {
        "range": "d2/testdata/d2compiler/TestCompile2/vars/errors/multi-part-map.d2,6:0:31-6:2:33",
        "errmsg": "d2/testdata/d2compiler/TestCompile2/vars/errors/multi-part-map.d2:7:1: cannot substitute composite variable \"x\" as part of a string"
      }
    ]
  }
}