∀ {α : Type u} [inst : BEq α] [inst_1 : Hashable α] {β : Type v} {m : Std.DHashMap.Raw α fun x => β} [EquivBEq α]
  [LawfulHashable α] [inst_4 : Inhabited β], m.WF → ∀ {k : α} {v : β}, Std.DHashMap.Raw.Const.get! (m.insert k v) k = v