Goal:
    A : Type  P : list A → A → Type  l : list A  a : All_fold P l
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in
    noConfusionHom_All_fold_obligation_1 A P l a a
      (noConfusionHom_All_fold_obligation_2 A P l a a eq_refl) = eq_refl)


DEBUG:Going to execute:
destruct p || (case p; clear p)
Level 7: evaluation of term
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l


Level 6: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l

Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l

Level 5: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l


Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l

Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l

Level 4: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l

Level 4: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l


Level 4: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l

Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P l)"
in environment:
A : Type
P : list A → A → Type
l : list A
a : All_fold P l