Goal:
  
  A : Type
  P : A → Prop
  Q : A → Prop
  p : A → bool
  x : A
  l : list A
  H : Q x
  HQ : Forall Q l
  Hp : ∀ x : A, Q x → reflect (P x) (p x)
  IHHQ : Forall P l → forallb p l = true
  HP1 : list A
  HP : Forall P HP1
  ============================
   (x :: l = HP1
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in forallb p (x :: l) = true)


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
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (Forall P HP1)"
in
environment:
A : Type
P, Q : A → Prop
p : A → bool
x : A
l : list A
H : Q x
HQ : Forall Q l
Hp : ∀ x : A, Q x → reflect (P x) (p x)
IHHQ : Forall P l → forallb p l = true
HP1 : list A
HP : Forall P HP1