optionalsSafeUnwrappingThrow.swift

enum ErrorsWhenCasting : Error {
  case wrongType
}

private static func value<T>(valueRaw: LoginResponse) throws -> T {
  guard let castedValue = valueRaw as? T else {
    throw ErrorsWhenCasting.wrongType
  }
  return castedValue
}

do {
  let valueNew = value(valueRaw: response)
} catch ErrorsWhenCasting.wrongType {
  print("Unable to cast, catched wrong type error")
}