∀ {α : Type u} {x : BEq α} {x_1 : Hashable α} {β : Type v} {m : Std.DHashMap α fun x => β} [EquivBEq α]
  [LawfulHashable α], List.Pairwise (fun a b => (a.1 == b.1) = false) (Std.DHashMap.Const.toList m)