Adding tuple destructuring

Consider code such as the following:

swift func foo(_: ((Int, Int) -> ()) {} foo { (x, y) in print(x + y) }

The migrator must add explicit tuple destructuring to continue building in Swift 4, such as shown here:

swift func foo(_: ((Int, Int) -> ()) {} foo { let (x, y) = $0; print(x + y) }

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