Mutating self (struct/enum) inside escaping closure in Swift 3.0

Question

In swift 2.2, We could mutate a struct or enum within a closure, when it was inside a mutating function. But in swift 3.0 its no longer possible. I get the following error

Answer 1

Yeah, you can do something like this.

struct Point {

    var x = 0.0, y = 0.0

    mutating func moveBy(x deltaX: Double, y deltaY: Double) {
        x += deltaX
        y += deltaY

        test { (a) -> Void in

            self.x = Double(a)
        }
    }

    mutating func test(myClosure: (_ a: Double) -> Void) {
        myClosure(3)
    }
}