final class Klass {
  static var current: Klass {
    fatalError()
  }
}
private struct Build<T> {
  let val: T
  unowned let bindings = Klass.current
}
private func phase<T>(_ val: T) -> Build<T> {
  return Build<T>(val: val)
}

// assert(field->getType()->isEqual(field->getParentInitializer()->getType()));