Goal:
  
  A : Type
  B : Type
  R : nat → A → B → Type
  n : nat
  l0 : list A
  l : list B
  a : All2i R n l0 l
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in
    noConfusionHom_All2i_obligation_1 A B R n l0 l a a
      (noConfusionHom_All2i_obligation_2 A B R n l0 l a a eq_refl) = eq_refl)


DEBUG:Going to execute:
destruct p || (case p; clear p)
Level 7: evaluation of term
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l


Level 6: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l

Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l

Level 5: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l


Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l

Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l

Level 4: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l

Level 4: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l


Level 4: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l

Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All2i R n l0 l)"
in
environment:
A : Type
B : Type
R : nat → A → B → Type
n : nat
l0 : list A
l : list B
a : All2i R n l0 l