Goal:
  
  A : Type
  P : list A → A → Type
  b0 : All_fold P []
  b' : list A
  b : All_fold P b'
  ============================
   ({| pr1 := []; pr2 := b0 |} = {| pr1 := b'; pr2 := b |}
    → let H := CoreTactics.block in
      NoConfusionHom_All_fold A P [] (All_fold_nil P) b0
      → let H0 := CoreTactics.block in All_fold_nil P = b0)


DEBUG:Going to execute:
destruct p || (case p; clear p)
Level 6: evaluation of term
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'


Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'

Level 4: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'

Level 4: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'


Level 4: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'

Level 4: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'

Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'

Level 3: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P b')"
in
environment:
A : Type
P : list A → A → Type
b0 : All_fold P []
b' : list A
b : All_fold P b'