Goal:
  
  A : Type
  P : A → A → Type
  l' : list A
  f : A → A
  hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
  o1' : list A
  o1 : list A
  o : OnOne2 P o1' o1
  ============================
   ({| pr1 := []; pr2 := l' |} = {| pr1 := o1'; pr2 := o1 |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in
      ∑ l'' : list A, OnOne2 (λ x y : A, P (f x) (f 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
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (OnOne2 P o1' o1)"
in
environment:
A : Type
P : A → A → Type
l' : list A
f : A → A
hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
o1', o1 : list A
o : OnOne2 P o1' o1