[swift-users] swift 4 compiler error tuple parameter does not support destructing

[CK TUNG]

I have the following code snippet that compile OK in swift 3

            bytes = Array(UnsafeBufferPointer(....))
            let filenamelength = bytes[(i+28)..<(i+28+2)]
                .enumerated()
                .map { (index, element) in return Int(Double(element) * pow(256,Double(index))) }
                .reduce(0, +)
 
I have the following code snippet that compile OK in swift 3
In Swift 4 (Xcode beta1) it compiled with error something like "... too complex"
Now in Swift 4 Xocde beta2 the error is tuple parameter element does not support destructing
what has been changed in swift 4 ?

Please help how to solve it ?

Thanks

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