Goal:
  
  A : Type
  B : A → Type
  C : A → Type
  f : ∀ x : A, B x → C x
  eos : CoreTactics.end_of_section
  fix_0 : ∀ (l : list A) (a : All B l),
            make_All_All_graph l a (make_All_All a)
  ============================
   (∀ (l : list A) (a : All B l), make_All_All_graph l a (make_All_All a))


DEBUG:Going to execute:
specialize_mutual