∀ {α : Type u} [inst : BEq α] [inst_1 : Hashable α] {β : Type v} [EquivBEq α] [LawfulHashable α] {l : List (α × β)}
  {k : α} [inst_4 : Inhabited β],
  (List.map Prod.fst l).contains k = false → Std.DHashMap.Raw.Const.get! (Std.DHashMap.Raw.Const.ofList l) k = default