Goal:
  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  tl : list A
  tl' : list A
  a : OnOne2All P bs tl tl'
  b : B
  bs0 : list B
  hd0 : A
  tl0 : list A
  tl'0 : list A
  b1 : OnOne2All P bs0 tl0 tl'0
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusion_OnOne2All A B P
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b0 :: bs;
                                            pr2 :=
                                              {|
                                                pr1 := hd :: tl;
                                                pr2 := hd :: tl'
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_tl P b0 bs hd tl tl' a
                                      |}
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b :: bs0;
                                            pr2 :=
                                              {|
                                                pr1 := hd0 :: tl0;
                                                pr2 := hd0 :: tl'0
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_tl P b bs0 hd0 tl0 tl'0
                                            b1
                                      |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
            |};
          pr2 := OnOne2All_tl P b0 bs hd tl tl' a
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl'0 |}
            |};
          pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl'0 b1
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
               |};
             pr2 := OnOne2All_tl P b0 bs hd tl tl' a
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl'0 |}
               |};
             pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl'0 b1
           |} e) = e)


DEBUG:Going to execute:
match goal with
           | hyp:context [ CoreTactics.block ]
             |- _ =>
                 cbn beta in hyp; eqns_specialize_eqs_block hyp;
                  cbn[eq_rect_r eq_rect] in hyp
           end
Level 2: Backtrace:

No matching clauses for match.

Goals:
  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  hd' : A
  tl : list A
  p : P b0 hd hd'
  e0 : #|bs| = #|tl|
  b : B
  bs0 : list B
  hd0 : A
  hd'0 : A
  tl0 : list A
  p0 : P b hd0 hd'0
  e : #|bs0| = #|tl0|
  ============================
   (∀ (H := CoreTactics.block) (e1 : NoConfusion_OnOne2All A B P
                                       {|
                                         pr1 :=
                                           {|
                                             pr1 := b0 :: bs;
                                             pr2 :=
                                               {|
                                                 pr1 := hd :: tl;
                                                 pr2 := hd' :: tl
                                               |}
                                           |};
                                         pr2 :=
                                           OnOne2All_hd P b0 bs hd hd' tl p
                                             e0
                                       |}
                                       {|
                                         pr1 :=
                                           {|
                                             pr1 := b :: bs0;
                                             pr2 :=
                                               {|
                                                 pr1 := hd0 :: tl0;
                                                 pr2 := hd'0 :: tl0
                                               |}
                                           |};
                                         pr2 :=
                                           OnOne2All_hd P b bs0 hd0 hd'0 tl0
                                             p0 e
                                       |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd' :: tl |}
            |};
          pr2 := OnOne2All_hd P b0 bs hd hd' tl p e0
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd'0 :: tl0 |}
            |};
          pr2 := OnOne2All_hd P b bs0 hd0 hd'0 tl0 p0 e
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd' :: tl |}
               |};
             pr2 := OnOne2All_hd P b0 bs hd hd' tl p e0
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd'0 :: tl0 |}
               |};
             pr2 := OnOne2All_hd P b bs0 hd0 hd'0 tl0 p0 e
           |} e1) = e1)

  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  hd' : A
  tl : list A
  p : P b0 hd hd'
  e0 : #|bs| = #|tl|
  b : B
  bs0 : list B
  hd0 : A
  tl0 : list A
  tl' : list A
  b1 : OnOne2All P bs0 tl0 tl'
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusion_OnOne2All A B P
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b0 :: bs;
                                            pr2 :=
                                              {|
                                                pr1 := hd :: tl;
                                                pr2 := hd' :: tl
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_hd P b0 bs hd hd' tl p e0
                                      |}
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b :: bs0;
                                            pr2 :=
                                              {|
                                                pr1 := hd0 :: tl0;
                                                pr2 := hd0 :: tl'
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_tl P b bs0 hd0 tl0 tl' b1
                                      |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd' :: tl |}
            |};
          pr2 := OnOne2All_hd P b0 bs hd hd' tl p e0
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl' |}
            |};
          pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl' b1
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd' :: tl |}
               |};
             pr2 := OnOne2All_hd P b0 bs hd hd' tl p e0
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl' |}
               |};
             pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl' b1
           |} e) = e)

  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  tl : list A
  tl' : list A
  a : OnOne2All P bs tl tl'
  b : B
  bs0 : list B
  hd0 : A
  hd' : A
  tl0 : list A
  p : P b hd0 hd'
  e : #|bs0| = #|tl0|
  ============================
   (∀ (H := CoreTactics.block) (e0 : NoConfusion_OnOne2All A B P
                                       {|
                                         pr1 :=
                                           {|
                                             pr1 := b0 :: bs;
                                             pr2 :=
                                               {|
                                                 pr1 := hd :: tl;
                                                 pr2 := hd :: tl'
                                               |}
                                           |};
                                         pr2 :=
                                           OnOne2All_tl P b0 bs hd tl tl' a
                                       |}
                                       {|
                                         pr1 :=
                                           {|
                                             pr1 := b :: bs0;
                                             pr2 :=
                                               {|
                                                 pr1 := hd0 :: tl0;
                                                 pr2 := hd' :: tl0
                                               |}
                                           |};
                                         pr2 :=
                                           OnOne2All_hd P b bs0 hd0 hd' tl0 p
                                             e
                                       |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
            |};
          pr2 := OnOne2All_tl P b0 bs hd tl tl' a
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd' :: tl0 |}
            |};
          pr2 := OnOne2All_hd P b bs0 hd0 hd' tl0 p e
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
               |};
             pr2 := OnOne2All_tl P b0 bs hd tl tl' a
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd' :: tl0 |}
               |};
             pr2 := OnOne2All_hd P b bs0 hd0 hd' tl0 p e
           |} e0) = e0)

  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  tl : list A
  tl' : list A
  a : OnOne2All P bs tl tl'
  b : B
  bs0 : list B
  hd0 : A
  tl0 : list A
  tl'0 : list A
  b1 : OnOne2All P bs0 tl0 tl'0
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusion_OnOne2All A B P
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b0 :: bs;
                                            pr2 :=
                                              {|
                                                pr1 := hd :: tl;
                                                pr2 := hd :: tl'
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_tl P b0 bs hd tl tl' a
                                      |}
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b :: bs0;
                                            pr2 :=
                                              {|
                                                pr1 := hd0 :: tl0;
                                                pr2 := hd0 :: tl'0
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_tl P b bs0 hd0 tl0 tl'0
                                            b1
                                      |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
            |};
          pr2 := OnOne2All_tl P b0 bs hd tl tl' a
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl'0 |}
            |};
          pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl'0 b1
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
               |};
             pr2 := OnOne2All_tl P b0 bs hd tl tl' a
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl'0 |}
               |};
             pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl'0 b1
           |} e) = e)


DEBUG:Going to execute:
DepElim.unblock_dep_elim
Level 2: Backtrace:

No matching clauses for match.

Goals:
  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  hd' : A
  tl : list A
  p : P b0 hd hd'
  e0 : #|bs| = #|tl|
  b : B
  bs0 : list B
  hd0 : A
  hd'0 : A
  tl0 : list A
  p0 : P b hd0 hd'0
  e : #|bs0| = #|tl0|
  ============================
   (∀ (H := CoreTactics.block) (e1 : NoConfusion_OnOne2All A B P
                                       {|
                                         pr1 :=
                                           {|
                                             pr1 := b0 :: bs;
                                             pr2 :=
                                               {|
                                                 pr1 := hd :: tl;
                                                 pr2 := hd' :: tl
                                               |}
                                           |};
                                         pr2 :=
                                           OnOne2All_hd P b0 bs hd hd' tl p
                                             e0
                                       |}
                                       {|
                                         pr1 :=
                                           {|
                                             pr1 := b :: bs0;
                                             pr2 :=
                                               {|
                                                 pr1 := hd0 :: tl0;
                                                 pr2 := hd'0 :: tl0
                                               |}
                                           |};
                                         pr2 :=
                                           OnOne2All_hd P b bs0 hd0 hd'0 tl0
                                             p0 e
                                       |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd' :: tl |}
            |};
          pr2 := OnOne2All_hd P b0 bs hd hd' tl p e0
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd'0 :: tl0 |}
            |};
          pr2 := OnOne2All_hd P b bs0 hd0 hd'0 tl0 p0 e
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd' :: tl |}
               |};
             pr2 := OnOne2All_hd P b0 bs hd hd' tl p e0
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd'0 :: tl0 |}
               |};
             pr2 := OnOne2All_hd P b bs0 hd0 hd'0 tl0 p0 e
           |} e1) = e1)

  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  hd' : A
  tl : list A
  p : P b0 hd hd'
  e0 : #|bs| = #|tl|
  b : B
  bs0 : list B
  hd0 : A
  tl0 : list A
  tl' : list A
  b1 : OnOne2All P bs0 tl0 tl'
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusion_OnOne2All A B P
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b0 :: bs;
                                            pr2 :=
                                              {|
                                                pr1 := hd :: tl;
                                                pr2 := hd' :: tl
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_hd P b0 bs hd hd' tl p e0
                                      |}
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b :: bs0;
                                            pr2 :=
                                              {|
                                                pr1 := hd0 :: tl0;
                                                pr2 := hd0 :: tl'
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_tl P b bs0 hd0 tl0 tl' b1
                                      |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd' :: tl |}
            |};
          pr2 := OnOne2All_hd P b0 bs hd hd' tl p e0
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl' |}
            |};
          pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl' b1
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd' :: tl |}
               |};
             pr2 := OnOne2All_hd P b0 bs hd hd' tl p e0
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl' |}
               |};
             pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl' b1
           |} e) = e)

  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  tl : list A
  tl' : list A
  a : OnOne2All P bs tl tl'
  b : B
  bs0 : list B
  hd0 : A
  hd' : A
  tl0 : list A
  p : P b hd0 hd'
  e : #|bs0| = #|tl0|
  ============================
   (∀ (H := CoreTactics.block) (e0 : NoConfusion_OnOne2All A B P
                                       {|
                                         pr1 :=
                                           {|
                                             pr1 := b0 :: bs;
                                             pr2 :=
                                               {|
                                                 pr1 := hd :: tl;
                                                 pr2 := hd :: tl'
                                               |}
                                           |};
                                         pr2 :=
                                           OnOne2All_tl P b0 bs hd tl tl' a
                                       |}
                                       {|
                                         pr1 :=
                                           {|
                                             pr1 := b :: bs0;
                                             pr2 :=
                                               {|
                                                 pr1 := hd0 :: tl0;
                                                 pr2 := hd' :: tl0
                                               |}
                                           |};
                                         pr2 :=
                                           OnOne2All_hd P b bs0 hd0 hd' tl0 p
                                             e
                                       |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
            |};
          pr2 := OnOne2All_tl P b0 bs hd tl tl' a
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd' :: tl0 |}
            |};
          pr2 := OnOne2All_hd P b bs0 hd0 hd' tl0 p e
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
               |};
             pr2 := OnOne2All_tl P b0 bs hd tl tl' a
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd' :: tl0 |}
               |};
             pr2 := OnOne2All_hd P b bs0 hd0 hd' tl0 p e
           |} e0) = e0)

  
  A : Type
  B : Type
  P : B → A → A → Type
  b0 : B
  bs : list B
  hd : A
  tl : list A
  tl' : list A
  a : OnOne2All P bs tl tl'
  b : B
  bs0 : list B
  hd0 : A
  tl0 : list A
  tl'0 : list A
  b1 : OnOne2All P bs0 tl0 tl'0
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusion_OnOne2All A B P
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b0 :: bs;
                                            pr2 :=
                                              {|
                                                pr1 := hd :: tl;
                                                pr2 := hd :: tl'
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_tl P b0 bs hd tl tl' a
                                      |}
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := b :: bs0;
                                            pr2 :=
                                              {|
                                                pr1 := hd0 :: tl0;
                                                pr2 := hd0 :: tl'0
                                              |}
                                          |};
                                        pr2 :=
                                          OnOne2All_tl P b bs0 hd0 tl0 tl'0
                                            b1
                                      |}),
      let H0 := CoreTactics.block in
      noConfusion_OnOne2All_obligation_2 A B P
        {|
          pr1 :=
            {|
              pr1 := b0 :: bs; pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
            |};
          pr2 := OnOne2All_tl P b0 bs hd tl tl' a
        |}
        {|
          pr1 :=
            {|
              pr1 := b :: bs0;
              pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl'0 |}
            |};
          pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl'0 b1
        |}
        (noConfusion_OnOne2All_obligation_1 A B P
           {|
             pr1 :=
               {|
                 pr1 := b0 :: bs;
                 pr2 := {| pr1 := hd :: tl; pr2 := hd :: tl' |}
               |};
             pr2 := OnOne2All_tl P b0 bs hd tl tl' a
           |}
           {|
             pr1 :=
               {|
                 pr1 := b :: bs0;
                 pr2 := {| pr1 := hd0 :: tl0; pr2 := hd0 :: tl'0 |}
               |};
             pr2 := OnOne2All_tl P b bs0 hd0 tl0 tl'0 b1
           |} e) = e)


DEBUG:Going to execute:
match goal with
           | |- let _ := CoreTactics.block in ?T =>
                 match T with
                 | context [ CoreTactics.block ] =>
                     change T; CoreTactics.intros_until_block
                 end
           | _ => CoreTactics.unblock_goal
           end