validation-test/compiler_crashers_2_fixed/0158-rdar40165062.swift

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

struct Foo<T, U> {
  var value: U
  func bar() -> Foo<T, U> {
    return Foo(value)
    // expected-error@-1 {{'Foo<T, U>' requires the types 'T' and 'U' be equivalent}}
  }
}

extension Foo where T == U {
  init(_ value: U)  {
    self.value = value
  }
}