Goal:
  
  A : Type
  P : A → A → Type
  HP : CRelationClasses.Transitive P
  z : list A
  ============================
   (All2 P [] [])


DEBUG:Going to execute:
<coq-core.plugins.ltac::constructor@0>
Level 1: evaluation returns
inversion_clear H
where
H := Hyz
of type
constr of type tacvalue