class Dependencies(Target):
  """A set of dependencies that may be depended upon,
  as if depending upon the set of dependencies directly.

  NB: This class is commonly referred to by the alias 'target' in BUILD files.
  """


class DeprecatedDependencies(Dependencies):
  """A subclass for Dependencies that warns that the 'dependencies' alias is deprecated."""

  def __init__(self, *args, **kwargs):
    logger.warn("For {0} : The alias 'dependencies(..)' has been deprecated in favor of "
                "'target(..)'"
                .format(kwargs['address'].spec))
    super(DeprecatedDependencies, self).__init__(*args, **kwargs)