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


DEBUG:Going to execute:
inversion_clear H
DEBUG LTAC Evaluated term: Hyz
DEBUG LTAC Evaluated term: Hyz