Goal:
  
  A : Type
  B : Type
  R : A → B → Prop
  R' : A → B → Prop
  H : Forall2 R' [] []
  ============================
   (Forall2 (λ (x : A) (y : B), R x y ∧ R' x y) [] [])


DEBUG:Going to execute:
<coq-core.plugins.ltac::constructor@0>