old_contents: """
  The ``foreign`` Devito backend is meant to be used by codes that don't
  run Python natively. This backend is only capable of generating and compiling
  kernels; however, kernels must be executed explicitly from outside Devito.
  Further, with the ``foreign`` backed, Devito doesn't allocate any data.
  """
  
  # The following used by backends.backendSelector
  from devito.function import Constant, Function, TimeFunction, SparseFunction  # noqa
  from devito.foreign.operator import Operator  # noqa
  
new_contents: """
  The ``foreign`` Devito backend is meant to be used by codes that don't
  run Python natively. This backend is only capable of generating and compiling
  kernels; however, kernels must be executed explicitly from outside Devito.
  Further, with the ``foreign`` backed, Devito doesn't allocate any data.
  """
  
  # The following used by backends.backendSelector
  from devito.function import Constant, Function, TimeFunction, SparseFunction  # noqa
  from devito.foreign.operator import Operator  # noqa
  from devito.types import CacheManager  # noqa
  
subject: Add leftover import due to disfunctional testing