Goal:
  
  A : Type
  P : nat → A → A → Type
  i : nat
  hd : A
  tl : list A
  tl' : list A
  a : OnOne2i P (S i) tl tl'
  idx3 : nat
  idx4 : list A
  idx2 : list A
  b : OnOne2i P idx3 idx4 idx2
  H : NoConfusion_OnOne2i A P
        {|
          pr1 :=
            {| pr1 := i; pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |} |};
          pr2 := OnOne2i_tl P i hd tl tl' a
        |}
        {|
          pr1 := {| pr1 := idx3; pr2 := {| pr1 := idx4; pr2 := idx2 |} |};
          pr2 := b
        |}
  ============================
   ({|
      pr1 := {| pr1 := i; pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |} |};
      pr2 := OnOne2i_tl P i hd tl tl' a
    |} =
    {|
      pr1 := {| pr1 := idx3; pr2 := {| pr1 := idx4; pr2 := idx2 |} |};
      pr2 := b
    |})


DEBUG:Going to execute:
intro_block_id H
DEBUG LTAC Evaluated term: (let H := CoreTactics.block in
                            NoConfusion_OnOne2i A P
                              {|
                                pr1 :=
                                  {|
                                    pr1 := i;
                                    pr2 :=
                                      {| pr1 := hd :: tl; pr2 := hd' :: tl |}
                                  |};
                                pr2 := OnOne2i_hd P i hd hd' tl p
                              |}
                              {|
                                pr1 :=
                                  {|
                                    pr1 := idx3;
                                    pr2 := {| pr1 := idx4; pr2 := idx2 |}
                                  |};
                                pr2 := b
                              |}
                            → let H0 := CoreTactics.block in
                              {|
                                pr1 :=
                                  {|
                                    pr1 := i;
                                    pr2 :=
                                      {| pr1 := hd :: tl; pr2 := hd' :: tl |}
                                  |};
                                pr2 := OnOne2i_hd P i hd hd' tl p
                              |} =
                              {|
                                pr1 :=
                                  {|
                                    pr1 := idx3;
                                    pr2 := {| pr1 := idx4; pr2 := idx2 |}
                                  |};
                                pr2 := b
                              |})