Here's a .avdl file with a deliberate typo.

@namespace("integrationtest")
protocol WeatherService {

  record GetForecastRequest {
    // NOTE: missing semicolon
    string city
    int days_required;
  }

  enum Weather {
    SUNNY,
    CLOUDY,
    RAINY
  }

  record GetForecastResponse {
    string last_updated;
    array<Weather> daily_forecasts;
  }

  void ping(