Goal:
  
  A : Type
  P : list A → A → Type
  d : A
  Γ : list A
  a : All_fold P Γ
  p : P Γ d
  b : All_fold P (d :: Γ)
  e : NoConfusionHom_All_fold A P (d :: Γ) (All_fold_cons P a p) b
  ============================
   (let H := CoreTactics.block in
    noConfusionHom_All_fold_obligation_2 A P (d :: Γ) 
      (All_fold_cons P a p) b
      (noConfusionHom_All_fold_obligation_1 A P (d :: Γ)
         (All_fold_cons P a p) b e) = e)


DEBUG:Going to execute:
revert id'; CoreTactics.revert_until id
Level 7: id'
 has value 
e