[
  {
    "evaluate": {
      "count": "number 3"
    }
  },
  {
    "callStack": [
      {
        "line": 16,
        "column": 2,
        "sourceText": "x = 2",
        "function": "foo"
      },
      {
        "line": 18,
        "column": 0,
        "sourceText": "foo()",
        "function": "Global code"
      }
    ]
  }
]