Goal:
  
  A : Type
  B : Type
  C : Type
  P : nat → A → B → Type
  Q : B → C → Type
  R : B → C → Type
  l'' : list C
  n : nat
  H1 : sigma (λ _ : list B, list C)
  H : All2 Q (pr1 H1) (pr2 H1)
  ============================
   ({| pr1 := []; pr2 := l'' |} = H1
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in
      (∀ (n : nat) (x : A) (y : B) (z : C), P n x y → Q y z → R y z)
      → All2 R [] l'')


DEBUG:Going to execute:
match type of id with
           | sigma _ =>
               let xn := fresh id "'" in
               destruct id as [xn id]; DepElim.decompose_exists xn id;
                cbv beta iota delta [TODO projection TODO projection]
                 in id, id'; DepElim.decompose_exists id id'
           | _ =>
               cbv beta iota delta [TODO projection TODO projection]
                in id, id'
           end