Goal:
  
  T : Type -> Type
  M : Monad T
  A : Type
  P : A -> Type
  Q : A -> Type
  f : forall x : A, ∥ Q x ∥ -> T (∥ P x ∥)
  l0 : list A
  a : A
  l : list A
  X : P a
  allq1 : list A
  allq : All Q allq1
  ============================
   (a :: l = allq1 ->
    let H := CoreTactics.block in let H0 := CoreTactics.block in All Q l)


DEBUG:Going to execute:
match p with
           | _ => generalize dependent p; intros p
           end
Level 1: evaluation returns
first
[ match p with
  | _ => generalize dependent p; intros p
  end
| intros
until
p
| intros
until
1
| intros ]
where
p := allq
of type
constr of type tacvalue