DEFINE_multi_enum_class in abseil/abseil-py

What the code was meant to do, written into the code itself as a docstring

Registers a flag whose value can be a list of enum members. Use the flag on the command line multiple times to place multiple enum values into the list. Args: name: str, the flag name. default: Union[Iterable[Enum], Iterable[Text], Enum, Text, None], the default value of the flag; see `DEFINE_multi`; only differences are documented here. If the value is a single Enum, it is treated as a single-item list of that Enum value. If it is an iterable, text values within the iterable will be converted to the equivalent Enum objects. enum_class: class, the Enum class with all the possible values for the flag. help: str, the help message. flag_values: :class:`FlagValues`, the FlagValues instance with which the flag will be registered. This should almost never need to be overridden. module_name: A string, the name of the Python module declaring this flag. If not provided, it will be computed using the stack trace of this call. case_sensitive: bool, whether to map strings to members of the enum_class without considering case. required: bool, is this a required flag. This must be used as a keyword argument. **args: Dictionary with extra keyword args that are passed to the `Flag.__init__`. Returns: a handle to defined flag.

The change

The check that tells the two apart

Check file absl/flags/tests/flags_test.py, taken without changes from the fix and copied onto the older code, so the exact same check runs against both versions.