Goal:
  
  A : Type
  P : list A → list A → A → A → Type
  Q : list A → A → Type
  d : A
  d' : A
  Γ : list A
  Γ' : list A
  X : All2_fold P Γ Γ'
  p : P Γ Γ' d d'
  IHX : All_fold Q Γ
        → All_fold Q Γ'
          → All2_fold
              (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
  l : All_fold Q Γ
  q : Q Γ d
  r1 : list A
  r : All_fold Q r1
  ============================
   (d' :: Γ' = r1
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in
      All2_fold (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y)
        (d :: Γ) (d' :: Γ'))


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 Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold Q r1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All_fold Q Γ
      → All_fold Q Γ'
        → All2_fold
            (λ (Γ Γ' : list A) (x y : A), Q Γ x × Q Γ' y × P Γ Γ' x y) Γ Γ'
l : All_fold Q Γ
q : Q Γ d
r1 : list A
r : All_fold Q r1