Goal:
  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  tl : list A
  tl' : list A
  X : OnOne2 P tl tl'
  IHX : All Q tl → All Q tl'
  H1 : list A
  H : All Q H1
  ============================
   (hd :: tl = H1
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All Q (hd :: tl'))


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
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (All Q H1)"
in
environment:
A : Type
P : A → A → Type
Q : A → Type
HPQ : ∀ x y : A, Q x → P x y → Q y
hd : A
tl, tl' : list A
X : OnOne2 P tl tl'
IHX : All Q tl → All Q tl'
H1 : list A
H : All Q H1