Goal:
    x : t  y : t  H : lt x y  H0 : lt y x  H1 : lt x x
  ============================
   (Lt = Gt)


DEBUG:Going to execute:
apply irreflexivity in H1
DEBUG LTAC Evaluated term: irreflexivity
Level 0: Backtrace:

Unable to apply lemma of type "Reflexive (complement ?R)"
on hypothesis of type "lt x y".
Level 0: Backtrace:

Unable to apply lemma of type "Reflexive (complement ?R)"
on hypothesis of type "lt x y".
Level 0: Backtrace:

Unable to apply lemma of type "Reflexive (complement ?R)"
on hypothesis of type "lt x y".
Level 0: Backtrace:

Unable to apply lemma of type "Reflexive (complement ?R)"
on hypothesis of type "lt x y".
DEBUG LTAC Evaluated term: (transitivity H H0)