Goal:
  
  eos : CoreTactics.end_of_section
  fix_0 : ∀ (A B : Type) (l : list A) (f : ∀ x : A, In x l → B),
            map_In_graph A B l f (map_In l f)
  ============================
   (∀ (A B : Type) (l : list A) (f : ∀ x : A, In x l → B),
      map_In_graph A B l f (map_In l f))


DEBUG:Going to execute:
match goal with
           | H:_ ∧ _ |- _ => destruct H
           | H:_ * _ |- _ => destruct H
           | H:?X → _, H':?X
             |- _ => match X with
                     | _ → _ => specialize (H H')
                     end
           | H:?A ∧ ?B → ?C |- _ => apply (uncurry_conj A B C) in H
           end