{
  "graph": null,
  "err": {
    "errs": [
      {
        "range": "d2/testdata/d2compiler/TestCompile2/vars/errors/spread-non-solo.d2,7:1:36-7:2:37",
        "errmsg": "d2/testdata/d2compiler/TestCompile2/vars/errors/spread-non-solo.d2:8:2: cannot substitute composite variable \"x\" as part of a string"
      }
    ]
  }
}