Goal:
    A : Type  P : list A → A → Type
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusionHom_All_fold A P []
                                      (All_fold_nil P) 
                                      (All_fold_nil P)),
      let H0 := CoreTactics.block in
      noConfusionHom_All_fold_obligation_2 A P [] 
        (All_fold_nil P) (All_fold_nil P)
        (noConfusionHom_All_fold_obligation_1 A P [] 
           (All_fold_nil P) (All_fold_nil P) e) = e)


DEBUG:Going to execute:
match T with
           | context [ CoreTactics.block ] =>
               change T; CoreTactics.intros_until_block
           end