Goal:
  
  A : Type
  B : Type
  C : Type
  Q : C → Type
  P : C → A → Prop
  fn : ∀ x : A, (∀ y : C, Q y → P y x) → B
  eos : CoreTactics.end_of_section
  fix_0 : ∀ (l : list A) (Hl : ∀ y : C, Q y → ∥ All (P y) l ∥),
            map_All_graph l Hl (map_All l Hl)
  ============================
   (∀ (l : list A) (Hl : ∀ y : C, Q y → ∥ All (P y) l ∥),
      map_All_graph l Hl (map_All l Hl))


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