Goal:
  
  A : Type
  B : Type
  C : Type
  D : Type
  R : C → D → Type
  f : A → C
  g : B → D
  a : A
  l : list A
  IHl : ∀ l' : list B,
          All2 R (map f l) (map g l')
          → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
  H1' : list C
  H1 : list D
  H : All2 R H1' H1
  ============================
   ({| pr1 := f a :: map f l; pr2 := [] |} = {| pr1 := H1'; pr2 := H1 |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in
      All2 (λ (x : A) (y : B), R (f x) (g y)) (a :: 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
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 R H1' H1)"
in
environment:
A : Type
B : Type
C : Type
D : Type
R : C → D → Type
f : A → C
g : B → D
a : A
l : list A
IHl : ∀ l' : list B,
        All2 R (map f l) (map g l')
        → All2 (λ (x : A) (y : B), R (f x) (g y)) l l'
H1' : list C
H1 : list D
H : All2 R H1' H1