Goal:
  
  A : Type
  B : Type
  P : A → Type
  Q : A → B → Type
  b : B
  l' : list B
  H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
  Hl1 : nat
  Hl : S #|l'| = Hl1
  ============================
   (0 = Hl1
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All2 Q [] (b :: l'))


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
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (S #|l'| = Hl1)"
in
environment:
A : Type
B : Type
P : A → Type
Q : A → B → Type
b : B
l' : list B
H2 : ∀ (x : A) (y : B), In y (b :: l') → P x → Q x y
Hl1 : nat
Hl : S #|l'| = Hl1