Goal:
  
  A : Type
  P : A → A → Type
  hd : A
  hd' : A
  tl : list A
  p : P hd hd'
  hd0 : A
  hd'0 : A
  tl0 : list A
  p0 : P hd0 hd'0
  ============================
   (∀ e : NoConfusion_OnOne2 A P
            {|
              pr1 := {| pr1 := hd :: tl; pr2 := hd' :: tl |};
              pr2 := OnOne2_hd P hd hd' tl p
            |}
            {|
              pr1 := {| pr1 := hd0 :: tl0; pr2 := hd'0 :: tl0 |};
              pr2 := OnOne2_hd P hd0 hd'0 tl0 p0
            |},
      let H := CoreTactics.block in
      noConfusion_OnOne2_obligation_2 A P
        {|
          pr1 := {| pr1 := hd :: tl; pr2 := hd' :: tl |};
          pr2 := OnOne2_hd P hd hd' tl p
        |}
        {|
          pr1 := {| pr1 := hd0 :: tl0; pr2 := hd'0 :: tl0 |};
          pr2 := OnOne2_hd P hd0 hd'0 tl0 p0
        |}
        (noConfusion_OnOne2_obligation_1 A P
           {|
             pr1 := {| pr1 := hd :: tl; pr2 := hd' :: tl |};
             pr2 := OnOne2_hd P hd hd' tl p
           |}
           {|
             pr1 := {| pr1 := hd0 :: tl0; pr2 := hd'0 :: tl0 |};
             pr2 := OnOne2_hd P hd0 hd'0 tl0 p0
           |} e) = e)


DEBUG:Going to execute:
match goal with
           | |- let _ := CoreTactics.block in _ => intros _
           | |- _ => try (intro; CoreTactics.intros_until_block)
           end