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
  ============================
   (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:
<coq-core.plugins.ltac::intros_until@0> $1

Goals:
  
  A : Type
  P : list A → A → Type
  b : All_fold P []
  e : NoConfusionHom_All_fold A P [] (All_fold_nil P) b
  ============================
   (noConfusionHom_All_fold_obligation_2 A P [] (All_fold_nil P) b
      (noConfusionHom_All_fold_obligation_1 A P [] (All_fold_nil P) b e) = e)

  
  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
  ============================
   (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:
intro_block_id H || intro_block H
Level 2: Backtrace:

No quantified hypothesis named b in current goal even after head-reduction.
Level 2: Backtrace:

No quantified hypothesis named b in current goal even after head-reduction.