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


DEBUG:Going to execute:
match goal with
           | hyp:context [ CoreTactics.block ]
             |- _ =>
                 cbn beta in hyp; eqns_specialize_eqs_block hyp;
                  cbn[eq_rect_r eq_rect] in hyp
           end