Dereferencable.swift

prefix operator *
protocol Dereferencable {
  associatedtype DereferencablePointee
  static prefix func * (pointer: Self) -> DereferencablePointee
}
extension UnsafePointer: Dereferencable  {
  typealias DereferencablePointee = Pointee
  static prefix func * (pointer: UnsafePointer) -> Pointee {
    return pointer.pointee
  }
}

func foo<T>(p: UnsafePointer<T>) {
  let t = *p
}