Goal:
    A : Type  B : Type  C : Type  R : A → B → C → Type  H : True
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in All3_nil = All3_nil)


DEBUG:Going to execute:
destruct p || (case p; clear p)
Level 8: evaluation of term
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True


Level 7: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True

Level 6: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True

Level 6: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True


Level 6: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True

Level 6: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True

Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True

Level 5: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True


Level 5: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True

Level 4: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage True" in
environment:
A : Type
B : Type
C : Type
R : A → B → C → Type
H : True