docs: def aggregate(variables, template):
    '''Generates a resolved "template" for **all** config sets and returns
  
    This function will extrapolate the ``template`` file using the contents of
    ``variables`` and will output a single (extrapolated, expanded) file.
  
  
    Parameters:
  
      variables (str): A string stream containing the variables to parse, in YAML
        format as explained on :py:func:`expand`.
  
      template (str): A string stream containing the template to extrapolate
  
  
    Returns:
  
      str: A generated template you can save
  
  
    Raises:
  
      jinja2.UndefinedError: if a variable used in the template is undefined
  
    '''
  
    env = jinja2.Environment(undefined=jinja2.StrictUndefined)
    d = {'cfgset': list(expand(variables)), 'rc': rc}
    return env.from_string(template).render(d)