this is <a>nested <b>{placeholder}</b></a>
---
{}
---
{
  "val": [
    {
      "type": 0,
      "value": "this is ",
      "location": {
        "start": {
          "offset": 0,
          "line": 1,
          "column": 1
        },
        "end": {
          "offset": 8,
          "line": 1,
          "column": 9
        }
      }
    },
    {
      "type": 8,
      "value": "a",
      "children": [
        {
          "type": 0,
          "value": "nested ",
          "location": {
            "start": {
              "offset": 11,
              "line": 1,
              "column": 12
            },
            "end": {
              "offset": 18,
              "line": 1,
              "column": 19
            }
          }
        },
        {
          "type": 8,
          "value": "b",
          "children": [
            {
              "type": 1,
              "value": "placeholder",
              "location": {
                "start": {
                  "offset": 21,
                  "line": 1,
                  "column": 22
                },
                "end": {
                  "offset": 34,
                  "line": 1,
                  "column": 35
                }
              }
            }
          ],
          "location": {
            "start": {
              "offset": 18,
              "line": 1,
              "column": 19
            },
            "end": {
              "offset": 38,
              "line": 1,
              "column": 39
            }
          }
        }
      ],
      "location": {
        "start": {
          "offset": 8,
          "line": 1,
          "column": 9
        },
        "end": {
          "offset": 42,
          "line": 1,
          "column": 43
        }
      }
    }
  ],
  "err": null
}