Why is ‘nil’ not compatible with ‘UnsafePointer’ in Swift 3?

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Try this:

let path = CGMutablePath()
path.move(to: CGPoint(x: 30, y: 0))

CGPath APIs are now imported as instance methods in Swift 3.
You can check them with Command-clicking on CGMutablePath.
Or see the latest reference of CGMutablePath.

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