[Accepted with Modification] SE-0253 - Callable values of user-defined nominal types

Evolution Announcements
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func callAsFunction has been merged and is available in latest development snapsnots from Swift.org - Download Swift.

I just tested swift-DEVELOPMENT-SNAPSHOT-2019-08-27-a:

struct Adder {
  var base: Int
  func callAsFunction(_ x: Int) -> Int {
    return x + base
  }
}
var adder = Adder(base: 3)
print(adder(10)) // 13

Thanks for your patience!

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