var data = Data()

let result1 = data.withUnsafeMutableBytes { (bufferPointer: UnsafeMutableRawBufferPointer) in
    // This works
    return 4
}

let result = data.withUnsafeMutableBytes { (bufferPointer: UnsafeMutableRawBufferPointer) in
    // This does not work
    // error: 'UnsafeMutableRawBufferPointer' is not convertible to 'UnsafeMutablePointer<_>'
    // It's like it's trying to call the deprecated version, but failing.
    guard let p = bufferPointer.baseAddress else { return 3 }
    return 4
}