Goal:
  
  A : Type
  P : list A → list A → A → A → Type
  Q : list A → list A → 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 : All2_fold Q Γ Γ'
        → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
  h1' : list A
  h1 : list A
  h : All2_fold Q h1' h1
  ============================
   ({| pr1 := d :: Γ; pr2 := d' :: Γ' |} = {| pr1 := h1'; pr2 := h1 |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in
      All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ 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
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2_fold Q h1' h1)"
in
environment:
A : Type
P : list A → list A → A → A → Type
Q : list A → list A → A → A → Type
d, d' : A
Γ, Γ' : list A
X : All2_fold P Γ Γ'
p : P Γ Γ' d d'
IHX : All2_fold Q Γ Γ'
      → All2_fold (λ (Γ Δ : list A) (x y : A), P Γ Δ x y × Q Γ Δ x y) Γ Γ'
h1', h1 : list A
h : All2_fold Q h1' h1