original_docstring: 
          Not all providers need stale refs to be cleaned manually. Override this
          function in a sub-class if this is needed.
          
docstring: Not all providers need stale refs to be cleaned manually. Override this
  function in a sub-class if this is needed.
docstring_tokens: Not all providers need stale refs to be cleaned manually . Override this function in a sub - class if this is needed .
code: def clean_stale_refs(self):
          '''
          Not all providers need stale refs to be cleaned manually. Override this
          function in a sub-class if this is needed.
          '''
          return []
code_tokens: def clean_stale_refs ( self ) : return [ ]
short_docstring: Not all providers need stale refs to be cleaned manually.
short_docstring_tokens: Not all providers need stale refs to be cleaned manually .
comment: '''
          Not all providers need stale refs to be cleaned manually. Override this
          function in a sub-class if this is needed.
          '''