Goal:
  
  A : Type
  B : Type
  P : A → B → Type
  Q : A → B → Type
  x : A
  y : B
  l : list A
  l' : list B
  r : P x y
  X : All2 P l l'
  IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
  H1' : list A
  H1 : list B
  H : All2 Q H1' H1
  ============================
   ({| pr1 := x :: l; pr2 := y :: l' |} = {| pr1 := H1'; pr2 := H1 |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All2 (Trel_conj P Q) (x :: l) (y :: 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 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2 Q H1' H1)"
in
environment:
A : Type
B : Type
P : A → B → Type
Q : A → B → Type
x : A
y : B
l : list A
l' : list B
r : P x y
X : All2 P l l'
IHX : All2 Q l l' → All2 (Trel_conj P Q) l l'
H1' : list A
H1 : list B
H : All2 Q H1' H1