{
  "expression": ["step", 0, "a", 0, "b", 0, "c"],
  "inputs": [[{}, {}]],
  "expected": {
    "compiled": {
      "result": "error",
      "errors": [
        {
          "key": "[5]",
          "error": "Input/output pairs for \"step\" expressions must be arranged with input values in strictly ascending order."
        }
      ]
    }
  }
}