swift-mirror/test/Concurrency/async_initializer_objc.swift

// RUN: %target-typecheck-verify-swift  -disable-availability-checking
// REQUIRES: concurrency
// REQUIRES: objc_interop

import Foundation

class X: NSObject {
  // expected-error@+1 {{'async' initializer cannot be represented in Objective-C}}
  @objc init(_ i : Int) async { }
}