Goal:
    A : Type  P : list A → A → Type  l : list A  a : All_fold P l
  ============================
   (noConfusionHom_All_fold_obligation_1 A P l a a
      (noConfusionHom_All_fold_obligation_2 A P l a a eq_refl) = eq_refl)


DEBUG:Going to execute:
try intros until H; intro_block_id H || intro_block H
Level 4: evaluation returns
try intros until H; intro_block_id H || intro_block H;
 (try simpl in H; DepElim.simplify_equations_in H)
where
H := a
of type
constr of type tacvalue