∀ {α β γ : Type w} [inst : Std.Iterator α Id β] {it : Std.Iter β} {m : Type w → Type w'} [inst_1 : Monad m]
  [inst_2 : MonadAttach m] [LawfulMonad m] [WeaklyLawfulMonadAttach m] [Std.Iterators.Finite α Id] {f : β → m γ},
  (Std.Iter.mapM f it).toList = List.mapM f it.toList