∀ {α : Type u} {β : Type v} {cmp : α → α → Ordering} {a : Option β}
  {a_1 : Std.TreeMap.Raw α (Lean.PrefixTreeNode α β cmp) cmp} {a_2 : Option β}
  {a_3 : Std.TreeMap.Raw α (Lean.PrefixTreeNode α β cmp) cmp},
  Lean.PrefixTreeNode.Node a a_1 = Lean.PrefixTreeNode.Node a_2 a_3 → a = a_2 ∧ a_1 = a_3