a '{a{ {}{}{}}}''' 
 {}
---
{}
---
{
  "val": null,
  "err": {
    "kind": 2,
    "message": "a '{a{ {}{}{}}}''' \n {}",
    "location": {
      "start": {
        "offset": 21,
        "line": 2,
        "column": 2
      },
      "end": {
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        "line": 2,
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}