∀ {β α : Type w} {m : Type w → Type w'} {n : Type x → Type x'} [inst : Monad n] [inst_1 : Std.Iterator α m β],
  Std.IteratorLoop.defaultImplementation =
    {
      forIn := fun lift γ Pl it init =>
        Std.IterM.DefaultConsumers.forIn' lift γ Pl it init it.IsPlausibleIndirectOutput ⋯ }