text: // This source file is part of the Swift.org open source project
  // Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
  // Licensed under Apache License v2.0 with Runtime Library Exception
  //
  // See https://swift.org/LICENSE.txt for license information
  // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
  
  // RUN: not %target-swift-frontend %s -typecheck
  extension A {
  public var b: a {
  }(A.d<T, Bool)))
  }
  protocol A {
  protocol A {
  typealias e: e? =
  