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 tauto_flags X1 X2 id =>
             <coq-core.plugins.tauto::flatten_contravariant_disj@0>