Goal:
  
  A : Type
  P : A → A → Type
  hd : A
  tl : list A
  tl' : list A
  a : OnOne2 P tl tl'
  hd0 : A
  hd' : A
  tl0 : list A
  p : P hd0 hd'
  ============================
   (∀ e : NoConfusion_OnOne2 A P
            {|
              pr1 := {| pr1 := hd :: tl; pr2 := hd :: tl' |};
              pr2 := OnOne2_tl P hd tl tl' a
            |}
            {|
              pr1 := {| pr1 := hd0 :: tl0; pr2 := hd' :: tl0 |};
              pr2 := OnOne2_hd P hd0 hd' tl0 p
            |},
      let H := CoreTactics.block in
      noConfusion_OnOne2_obligation_2 A P
        {|
          pr1 := {| pr1 := hd :: tl; pr2 := hd :: tl' |};
          pr2 := OnOne2_tl P hd tl tl' a
        |}
        {|
          pr1 := {| pr1 := hd0 :: tl0; pr2 := hd' :: tl0 |};
          pr2 := OnOne2_hd P hd0 hd' tl0 p
        |}
        (noConfusion_OnOne2_obligation_1 A P
           {|
             pr1 := {| pr1 := hd :: tl; pr2 := hd :: tl' |};
             pr2 := OnOne2_tl P hd tl tl' a
           |}
           {|
             pr1 := {| pr1 := hd0 :: tl0; pr2 := hd' :: tl0 |};
             pr2 := OnOne2_hd P hd0 hd' tl0 p
           |} e) = e)


DEBUG:Going to execute:
CoreTactics.intros_until_block
DEBUG LTAC Evaluated term: (∀ e : NoConfusion_OnOne2 A P
                                    {|
                                      pr1 :=
                                        {|
                                          pr1 := hd :: tl; pr2 := hd :: tl'
                                        |};
                                      pr2 := OnOne2_tl P hd tl tl' a
                                    |}
                                    {|
                                      pr1 :=
                                        {|
                                          pr1 := hd0 :: tl0;
                                          pr2 := hd' :: tl0
                                        |};
                                      pr2 := OnOne2_hd P hd0 hd' tl0 p
                                    |},
                              let H := CoreTactics.block in
                              noConfusion_OnOne2_obligation_2 A P
                                {|
                                  pr1 :=
                                    {| pr1 := hd :: tl; pr2 := hd :: tl' |};
                                  pr2 := OnOne2_tl P hd tl tl' a
                                |}
                                {|
                                  pr1 :=
                                    {|
                                      pr1 := hd0 :: tl0; pr2 := hd' :: tl0
                                    |};
                                  pr2 := OnOne2_hd P hd0 hd' tl0 p
                                |}
                                (noConfusion_OnOne2_obligation_1 A P
                                   {|
                                     pr1 :=
                                       {|
                                         pr1 := hd :: tl; pr2 := hd :: tl'
                                       |};
                                     pr2 := OnOne2_tl P hd tl tl' a
                                   |}
                                   {|
                                     pr1 :=
                                       {|
                                         pr1 := hd0 :: tl0; pr2 := hd' :: tl0
                                       |};
                                     pr2 := OnOne2_hd P hd0 hd' tl0 p
                                   |} e) = e)