Goal:
    A : Type  H : ReflectEq A  l1 : list A  l2 : list A  l : list A
  ============================
   (l2 = rev l ++ l1 → is_suffix l1 l2)


DEBUG:Going to execute:
move  =>->
DEBUG LTAC Evaluated term: rev_app
DEBUG LTAC Evaluated term: rev_app
DEBUG LTAC Evaluated term: rev_invol
DEBUG LTAC Evaluated term: rev_invol
DEBUG LTAC Evaluated term: rev_invol