∀ {n : ℕ} {map : Std.HashMap (Std.Tactic.BVDecide.LRAT.Internal.PosFin n) Bool}
  (l x : Std.Sat.Literal (Std.Tactic.BVDecide.LRAT.Internal.PosFin n))
  (xs : List (Std.Sat.Literal (Std.Tactic.BVDecide.LRAT.Internal.PosFin n)))
  {acc : Option (Std.HashMap (Std.Tactic.BVDecide.LRAT.Internal.PosFin n) Bool)},
  List.foldl Std.Tactic.BVDecide.LRAT.Internal.DefaultClause.ofArray.folder
        (Std.Tactic.BVDecide.LRAT.Internal.DefaultClause.ofArray.folder acc x) xs =
      some map →
    l = x → l ∈ map.toList