Goal:
  
  A : Type
  P : list A → A → Type
  Q : list A → list A → A → A → Type
  Δ : list A
  d : A
  Γ : list A
  hlen : #|d :: Γ| = #|Δ|
  ha : All_fold P Γ
  p : P Γ d
  hb : All_fold P Δ
  ============================
   (let H := CoreTactics.block in
    (∀ (Δ Δ' : list A) (x y : A),
       All_fold P Δ
       → All_fold P Δ' → All2_fold Q Δ Δ' → P Δ x → P Δ' y → Q Δ Δ' x y)
    → (∀ Δ : list A, #|Γ| = #|Δ| → All_fold P Δ → All2_fold Q Γ Δ)
      → let H0 := CoreTactics.block in All2_fold Q (d :: Γ) Δ)


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 Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All_fold P Δ)"
in
environment:
A : Type
P : list A → A → Type
Q : list A → list A → A → A → Type
Δ : list A
d : A
Γ : list A
hlen : #|d :: Γ| = #|Δ|
ha : All_fold P Γ
p : P Γ d
hb : All_fold P Δ