Goal:
    A : Type  B : Type  C : Type  R : A → B → C → Type
  ============================
   (let H := CoreTactics.block in
    noConfusionHom_All3_obligation_1 A B C R [] [] [] All3_nil All3_nil
      (noConfusionHom_All3_obligation_2 A B C R [] [] [] All3_nil All3_nil
         eq_refl) = eq_refl)


DEBUG:Going to execute:
CoreTactics.intros_until_block
DEBUG LTAC Evaluated term: (let H := CoreTactics.block in
                            noConfusionHom_All3_obligation_1 A B C R [] [] []
                              All3_nil All3_nil
                              (noConfusionHom_All3_obligation_2 A B C R [] []
                                 [] All3_nil All3_nil eq_refl) = eq_refl)