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 Γ
  p0 : P Γ d
  H : sigma (λ _ : All_fold P Γ, P Γ d)
  e : {| pr1 := a; pr2 := p |} = H
  ============================
   (noConfusionHom_All_fold_obligation_2 A P (d :: Γ) 
      (All_fold_cons P a p) (All_fold_cons P (pr1 H) (pr2 H))
      (noConfusionHom_All_fold_obligation_1 A P (d :: Γ)
         (All_fold_cons P a p) (All_fold_cons P (pr1 H) (pr2 H)) e) = e)


DEBUG:Going to execute:
destruct H