File: rdar122587920.swift

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// RUN: %target-typecheck-verify-swift

struct S<Element> {}

extension S: Sequence, IteratorProtocol {
  mutating func next() -> Element?? {
    fatalError()
  }
}

extension S: Collection {
  var startIndex: Int {
    fatalError()
  }

  var endIndex: Int {
    fatalError()
  }

  subscript(_ index: Int) -> Element? {
    fatalError()
  }

  func index(after index: Int) -> Int {
    fatalError()
  }
}

let x: S<Int>.Type = S<Int>.Iterator.self