Goal:
    A : Type  H : ReflectEq A  l2 : list A  l : list A
  ============================
   (is_prefix [] (fst (fst (split_prefix [] l2))))


DEBUG:Going to execute:
apply nil_prefix
DEBUG LTAC Evaluated term: is_prefix_nil
DEBUG LTAC Evaluated term: (is_prefix_nil l _view_subject_)