∀ {α : Type u} {β : α → Type v} {δ : Type w} {m : Type w → Type w'} [inst : Monad m]
  (as : Std.DHashMap.Internal.AssocList α β) (init : δ) (f : (a : α) → β a → δ → m (ForInStep δ)),
  as.forInStep init f = Std.DHashMap.Internal.AssocList.forInStep.go✝ f as init