Identify the mistake in this Swift code snippet intended to save a password to the Keychain:

Identify the mistake in this Swift code snippet intended to save a password to the Keychain:

let password = "securePass"
let data = password.data(using: .utf8)
let query: [String: Any] = [
  kSecClass as String: kSecClassGenericPassword,
  kSecAttrAccount as String: "user",
  kSecValueData as String: data as Any
]
let status = SecItemAdd(query as CFDictionary, nil)