Goal:
    A : Type  P : list A → A → Type  x : A  a1 : list A  a : All_fold P a1
  ============================
   ([x] = a1
    → let H := CoreTactics.block in let H0 := CoreTactics.block in P [] x)


DEBUG:Going to execute:
destruct p || (case p; clear p)
Level 4: evaluation of term
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P a1)"
in environment:
A : Type
P : list A → A → Type
x : A
a1 : list A
a : All_fold P a1