Goal:
    X1' : list A.t  X1 : list A.t  X : lt_ X1' X1
  ============================
   (let H := CoreTactics.block in
    forall x : t,
    {| pr1 := x; pr2 := x |} = {| pr1 := X1'; pr2 := X1 |} ->
    let H0 := CoreTactics.block in let H1 := CoreTactics.block in False)


DEBUG:Going to execute:
induction p
Level 4: evaluation of term
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ X1' X1)"
in environment:
X1', X1 : list A.t
X : lt_ X1' X1


Goals:
    hd : A.t  tl : list A.t
  ============================
   (let H := CoreTactics.block in
    forall x : t,
    {| pr1 := x; pr2 := x |} = {| pr1 := []; pr2 := hd :: tl |} ->
    let H0 := CoreTactics.block in let H1 := CoreTactics.block in False)

    hd : A.t  tl : list A.t  hd' : A.t  tl' : list A.t  H : A.lt hd hd'
  ============================
   (let H := CoreTactics.block in
    forall x : t,
    {| pr1 := x; pr2 := x |} = {| pr1 := hd :: tl; pr2 := hd' :: tl' |} ->
    let H0 := CoreTactics.block in let H1 := CoreTactics.block in False)

  
  hd : A.t
  tl : t
  tl' : t
  X : lt_ tl tl'
  IHX : let H := CoreTactics.block in
        forall x : t,
        {| pr1 := x; pr2 := x |} = {| pr1 := tl; pr2 := tl' |} ->
        let H0 := CoreTactics.block in let H1 := CoreTactics.block in False
  ============================
   (let H := CoreTactics.block in
    forall x : t,
    {| pr1 := x; pr2 := x |} = {| pr1 := hd :: tl; pr2 := hd :: tl' |} ->
    let H0 := CoreTactics.block in let H1 := CoreTactics.block in False)


DEBUG:Going to execute:
CoreTactics.intros_until_block

Goals:
    hd : A.t  tl : list A.t
  ============================
   (let H := CoreTactics.block in
    forall x : t,
    {| pr1 := x; pr2 := x |} = {| pr1 := []; pr2 := hd :: tl |} ->
    let H0 := CoreTactics.block in let H1 := CoreTactics.block in False)

    hd : A.t  tl : list A.t  hd' : A.t  tl' : list A.t  H : A.lt hd hd'
  ============================
   (let H := CoreTactics.block in
    forall x : t,
    {| pr1 := x; pr2 := x |} = {| pr1 := hd :: tl; pr2 := hd' :: tl' |} ->
    let H0 := CoreTactics.block in let H1 := CoreTactics.block in False)

  
  hd : A.t
  tl : t
  tl' : t
  X : lt_ tl tl'
  IHX : let H := CoreTactics.block in
        forall x : t,
        {| pr1 := x; pr2 := x |} = {| pr1 := tl; pr2 := tl' |} ->
        let H0 := CoreTactics.block in let H1 := CoreTactics.block in False
  ============================
   (let H := CoreTactics.block in
    forall x : t,
    {| pr1 := x; pr2 := x |} = {| pr1 := hd :: tl; pr2 := hd :: tl' |} ->
    let H0 := CoreTactics.block in let H1 := CoreTactics.block in False)


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