{
  "expression": ["<", ["boolean", ["get", "x"]], ["boolean", ["get", "y"]]],
  "expected": {
    "compiled": {
      "result": "error",
      "errors": [
        {
          "key": "[1]",
          "error": "\"<\" comparisons are not supported for type 'boolean'."
        }
      ]
    }
  }
}