∀ {α : Type u} [inst : BEq α] [inst_1 : Hashable α] {β : Type v} [EquivBEq α] [LawfulHashable α] {l : List (α × β)}
  {k k' : α},
  (k == k') = true →
    ∀ {v : β},
      List.Pairwise (fun a b => (a.1 == b.1) = false) l →
        (k, v) ∈ l →
          ∀ {h : k' ∈ Std.DHashMap.Raw.Const.ofList l},
            Std.DHashMap.Raw.Const.get (Std.DHashMap.Raw.Const.ofList l) k' h = v