<test>a</123>
---
{}
---
{
  "val": null,
  "err": {
    "kind": 23,
    "message": "<test>a</123>",
    "location": {
      "start": {
        "offset": 7,
        "line": 1,
        "column": 8
      },
      "end": {
        "offset": 9,
        "line": 1,
        "column": 10
      }
    }
  }
}