docs: def bind(self, study, **kwargs):  # @UnusedVariable
          """
          Returns a copy of the Spec bound to the given study
  
          Parameters
          ----------
          study : Study
              A study to bind the fileset spec to (should happen in the
              study __init__)
          """
          if self._study is not None:
              # Avoid rebinding specs in sub-studies that have already
              # been bound to MultiStudy
              bound = self
          else:
              bound = copy(self)
              bound._study = study
              if not hasattr(study, self.pipeline_getter):
                  raise ArcanaError(
                      "{} does not have a method named '{}' required to "
                      "derive {}".format(study, self.pipeline_getter,
                                         self))
              bound._bind_tree(study.tree)
          return bound