Goal:
  
  A : Type
  P : A → Type
  p : A → bool
  q : A → bool
  H : ∀ x : A, P x → p x = q x
  ============================
   (true = true)


DEBUG:Going to execute:
fun id0 id1 X2 => assert X2; [ exact (id0 id1) | clear id0 ]