∀ (α : Type u_1) (A : α → PSet.{u_1}) (motive : Option (PSet.mk α A).Type → Prop) (o : Option (PSet.mk α A).Type),
  (∀ (a : (PSet.mk α A).Type), motive (some a)) → (∀ (a : Unit), motive none) → motive o