// RUN: %target-typecheck-verify-swift -swift-version 3
// RUN: %target-typecheck-verify-swift -swift-version 4

// rdar://problem/31969605

class Base {}
class Derived : Base {}

protocol Refined {}
protocol Proto : Refined {}
extension Base : Refined {}

func baseFn(_: Base) {}

func superclassConversion(fn: @escaping (Base) -> ()) {
  let _: (Derived) -> () = fn
}

func existentialConversion(fn: @escaping (Refined) -> ()) {
  let _: (Proto) -> () = fn
  let _: (Base) -> () = fn
  let _: (Derived) -> () = fn
}

// rdar://problem/31725325

func a<b>(_: [(String, (b) -> () -> Void)]) {}
func a<b>(_: [(String, (b) -> () throws -> Void)]) {}

class c {
  func e() {}
  static var d = [("", e)]
}
a(c.d)

func b<T>(_: (T) -> () -> ()) {}

b(c.e)

func bar(_: () -> ()) {}
func bar(_: () throws -> ()) {}
func bar_empty() {}

bar(bar_empty)