docs: def side_effect_as_string(*args):
      '''
      side_effect_as_string() -> "ANY_FUNCTION(ANY_ARGS, ANY_KWARGS)"
      side_effect_as_string("foo") -> "foo(ANY_ARGS, ANY_KWARGS)"
      side_effect_as_string("foo", (42, )) -> "foo(42, ANY_KWARGS)"
      side_effect_as_string("foo", (42, 18)) -> "foo(42, 18, ANY_KWARGS)"
      side_effect_as_string("foo", (), {}) -> "foo()"
      side_effect_as_string("foo", (), {"barr": "spam"}) -> "foo(barr=\"spam\")"
      side_effect_as_string("foo", (), {}, None) -> "foo(): None"
      side_effect_as_string("foo", None, {}, 42) -> "foo(ANY_ARGS): 42"
      '''
      fun_id = "ANY_FUNCTION"
      se_args = None
      se_kwargs= None
  
      if len(args) > 0:
          fun_id = args[0] or "ANY_FUNCTION"
  
      if len(args) > 1:
          se_args = args[1]
  
      if len(args) > 2:
          se_kwargs = args[2]
  
      if se_args is None:
          args_desc = ["ANY_ARGS"]
      elif isinstance(se_args, tuple):
          args_desc = [repr(a) for a in se_args]
      else:
          args_desc = [str(se_args)]
  
      if se_kwargs is None:
          kwargs_desc = ["ANY_KWARGS"]
      elif isinstance(se_kwargs, dict):
          kwargs_desc = ["%s=%r" % (n, v) for n, v in se_kwargs.items()]
      else:
          kwargs_desc = [str(se_kwargs)]
  
      params = ", ".join(args_desc + kwargs_desc)
      text = "%s(%s)" % (fun_id, params)
  
      if len(args) < 5:
          return text
  
      if len(args) > 5:
          raise RuntimeError("Invalid side-effect specification")
  
      result = args[4]
      return text + ": " + repr(result)