∀ {α : Type u} [inst : BEq α] [inst_1 : Hashable α] [EquivBEq α] [LawfulHashable α] {l : List α} {k k' : α},
  (k == k') = true →
    List.Pairwise (fun a b => (a == b) = false) l → k ∈ l → (Std.HashMap.Raw.unitOfList l).getKey? k' = some k