Goal:
  
  G : t
  s0 : VSet.t
  x : V.t
  s1 : VSet.t
  s' : VSet.t
  x0 : V.t
  y : V.t
  z : V.t
  d : DisjointAdd x0 s1 s'
  e : EdgeOf x0 y
  b : SPath s1 y z
  ============================
   (forall
      e0 : NoConfusion_SPath
             {|
               pr1 := {| pr1 := s0; pr2 := {| pr1 := x; pr2 := x |} |};
               pr2 := spath_refl s0 x
             |}
             {|
               pr1 := {| pr1 := s'; pr2 := {| pr1 := x0; pr2 := z |} |};
               pr2 := spath_step d e b
             |},
    let H := CoreTactics.block in
    noConfusion_SPath_obligation_2
      {|
        pr1 := {| pr1 := s0; pr2 := {| pr1 := x; pr2 := x |} |};
        pr2 := spath_refl s0 x
      |}
      {|
        pr1 := {| pr1 := s'; pr2 := {| pr1 := x0; pr2 := z |} |};
        pr2 := spath_step d e b
      |}
      (noConfusion_SPath_obligation_1
         {|
           pr1 := {| pr1 := s0; pr2 := {| pr1 := x; pr2 := x |} |};
           pr2 := spath_refl s0 x
         |}
         {|
           pr1 := {| pr1 := s'; pr2 := {| pr1 := x0; pr2 := z |} |};
           pr2 := spath_step d e b
         |} e0) = e0)


DEBUG:Going to execute:
CoreTactics.intros_until_block
DEBUG LTAC Evaluated term: (forall
                              e0 : NoConfusion_SPath
                                     {|
                                       pr1 :=
                                         {|
                                           pr1 := s0;
                                           pr2 := {| pr1 := x; pr2 := x |}
                                         |};
                                       pr2 := spath_refl s0 x
                                     |}
                                     {|
                                       pr1 :=
                                         {|
                                           pr1 := s';
                                           pr2 := {| pr1 := x0; pr2 := z |}
                                         |};
                                       pr2 := spath_step d e b
                                     |},
                            let H := CoreTactics.block in
                            noConfusion_SPath_obligation_2
                              {|
                                pr1 :=
                                  {|
                                    pr1 := s0;
                                    pr2 := {| pr1 := x; pr2 := x |}
                                  |};
                                pr2 := spath_refl s0 x
                              |}
                              {|
                                pr1 :=
                                  {|
                                    pr1 := s';
                                    pr2 := {| pr1 := x0; pr2 := z |}
                                  |};
                                pr2 := spath_step d e b
                              |}
                              (noConfusion_SPath_obligation_1
                                 {|
                                   pr1 :=
                                     {|
                                       pr1 := s0;
                                       pr2 := {| pr1 := x; pr2 := x |}
                                     |};
                                   pr2 := spath_refl s0 x
                                 |}
                                 {|
                                   pr1 :=
                                     {|
                                       pr1 := s';
                                       pr2 := {| pr1 := x0; pr2 := z |}
                                     |};
                                   pr2 := spath_step d e b
                                 |} e0) = e0)