old_contents: from .direct import *
  from .lbfgs import *
  
  __all__ = []
  __all__ += direct.__all__
  __all__ += lbfgsb.__all__
  
new_contents: from .direct import *
  from .lbfgs import *
  
  __all__ = []
  __all__ += direct.__all__
  __all__ += lbfgs.__all__
  
subject: Fix a minor bug due to renaming the lbfgs module.