gistfile1.cs

public class TestModule : NancyModule
{
  public TestModule()
  {
    Get["/error-handled"] = _ => {
                                    // the error handler is called
                                    var x = 0;
				    return (89/x).ToString();
                                  };

    Get["error-unhandled"] = _ => View["horked"];
  }
}