Goal:
  
  A : Type
  B : Type
  P : A → B → Type
  Q : A → B → Type
  H1' : list A
  H1 : list B
  H : All2 Q H1' H1
  ============================
   ({| pr1 := []; pr2 := [] |} = {| pr1 := H1'; pr2 := H1 |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All2 (Trel_conj P Q) [] [])


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 := H
of type
ident of type tacvalue

Level 1: evaluation returns
first
[ match p with
  | _ => generalize dependent p; intros p
  end
| intros
until
p
| intros
until
1
| intros ]
where
p := H
of type
ident of type tacvalue