Goal:
  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  hd' : A
  tl : list A
  p : P hd hd'
  H : All Q (hd :: tl)
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in All Q (hd' :: tl))


DEBUG:Going to execute:
progress (autounfold with equations in e; simpl in e)
Level 1: evaluation returns
repeat progress (autounfold with equations in e; simpl in e)
where
e := H
of type
ident of type tacvalue

Level 1: evaluation returns
repeat progress (autounfold with equations in e; simpl in e)
where
e := H
of type
ident of type tacvalue