Goal:
    A : Type  P : A → Prop  Q : A → Prop
  ============================
   (All P [] → All Q [] → 0 = 0 → All2 (λ x y : A, P x ∧ Q y) [] [])


DEBUG:Going to execute:
<coq-core.plugins.ltac::auto@0> $1 $2 $3