Goal:
  
  A : Type
  B : Type
  C : Type
  Q : C → Type
  P : C → A → Prop
  Q' : B → Type
  R : C → A → Prop
  f : ∀ x : A, (∀ y : C, Q y → R y x) → B
  args : list A
  ha : ∀ y : C, Q y → ∥ All (R y) args ∥
  packcall := {| pr1 := args; pr2 := ha |}
           : sigma (λ l : list A, ∀ y : C, Q y → ∥ All (R y) l ∥)
  packcall_fn := {|
                   pr1 := packcall;
                   pr2 := map_All f (pr1 packcall) (pr2 packcall)
                 |}
              : sigma
                  (λ _ : sigma (λ l : list A, ∀ y : C, Q y → ∥ All (R y) l ∥),
                     list B)
  ============================
   (packcall_fn =
    {|
      pr1 := {| pr1 := args; pr2 := ha |};
      pr2 :=
        map_All f (pr1 {| pr1 := args; pr2 := ha |})
          (pr2 {| pr1 := args; pr2 := ha |})
    |}
    → let H := CoreTactics.block in
      (∀ y : C, Q y → All (P y) args)
      → (∀ (x : A) (y : C) (rx : ∀ y0 : C, Q y0 → R y0 x),
           P y x → Q' (f x rx)) → ∀ y : C, Q y → All Q' (map_All f args ha))


DEBUG:Going to execute:
refine (DepElim.eq_simplification_sigma1 _ _ _ _ _) ||
             refine (DepElim.eq_simplification_sigma1_nondep_dep _ _ _ _ _)
              || refine (DepElim.eq_simplification_sigma1_dep _ _ _ _ _)
DEBUG LTAC Evaluated term: (packcall_fn =
                            {|
                              pr1 := {| pr1 := args; pr2 := ha |};
                              pr2 :=
                                map_All f (pr1 {| pr1 := args; pr2 := ha |})
                                  (pr2 {| pr1 := args; pr2 := ha |})
                            |}
                            → let H := CoreTactics.block in
                              (∀ y : C, Q y → All (P y) args)
                              → (∀ (x : A) (y : C) 
                                   (rx : ∀ y0 : C, Q y0 → R y0 x),
                                   P y x → Q' (f x rx))
                                → ∀ y : C, Q y → All Q' (map_All f args ha))
Level 2: evaluation returns
idtac of type tacvalue