Goal:
  
  z : t
  hd : A.t
  tl : list A.t
  H1' : list A.t
  H1 : list A.t
  H : lt_ H1' H1
  ============================
   ({| pr1 := hd :: tl; pr2 := z |} = {| pr1 := H1'; pr2 := H1 |} ->
    let H := CoreTactics.block in let H0 := CoreTactics.block in lt [] z)


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
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1


Level 3: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1

Level 2: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1


Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1

Level 2: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1

Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1

Level 1: evaluation
raised the exception
Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1


Level 1: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1

Level 0: Backtrace:


Could not find an instance for "DepElim.DependentEliminationPackage
                                  (lt_ H1' H1)"
in environment:
z : t
hd : A.t
tl, H1', H1 : list A.t
H : lt_ H1' H1