{
  "type": "Program",
  "sourceType": "module",
  "body": [
    {
      "type": "ExpressionStatement",
      "expression": {
        "type": "CallExpression",
        "callee": {
          "type": "Identifier",
          "name": "foo"
        },
        "arguments": [
          {
            "type": "CallExpression",
            "callee": {
              "type": "Identifier",
              "name": "bar"
            },
            "arguments": []
          }
        ]
      }
    }
  ]
}