Goal:
  
  A : Type
  P : list A → A → Type
  b : All_fold P []
  H : NoConfusionHom_All_fold A P [] (All_fold_nil P) b
  ============================
   (let H := CoreTactics.block in All_fold_nil P = b)


DEBUG:Going to execute:
CoreTactics.on_last_hyp
            ltac:(fun id' =>
                    match id' with
                    | id => idtac
                    | _ => revert id'; CoreTactics.revert_until id
                    end)