old_contents: from linpred import *
  import linpred
  __all__ = linpred.__all__
  
  from tools import *
  import tools
  __all__ += tools.__all__
  
new_contents: from linpred import *
  import linpred
  __all__ = linpred.__all__
  
  from tools import *
  import tools
  __all__ += tools.__all__
  
  from numpy.testing import Tester
  
  test = Tester().test
  bench = Tester().bench
  
subject: Add module-wide bench and test functions.