Goal:
  
  A : Type
  B : Type
  R : A → B → Type
  R' : ∀ (a : A) (b : B), R a b → Type
  H : True
  ============================
   (All2_dep_nil = All2_dep_nil)


DEBUG:Going to execute:
fun H =>
             match goal with
             | H':_ |- _ => match H' with
                            | H => idtac
                            end
             end