[
  {
    "type": "identifier",
    "value": "foo"
  },
  {
    "type": "punctuator",
    "value": "("
  },
  {
    "type": "punctuator",
    "value": "("
  },
  {
    "type": "punctuator",
    "value": ")"
  },
  {
    "type": "operator",
    "value": "=>"
  },
  {
    "type": "indention",
    "value": 1
  },
  {
    "type": "identifier",
    "value": "return"
  },
  {
    "type": "literal",
    "value": "true"
  },
  {
    "type": "indention",
    "value": 0
  },
  {
    "type": "punctuator",
    "value": ")"
  },
  {
    "type": "indention",
    "value": 0
  }
]