def test_frame_init():
        """
        Different ways of providing the frame.
        """
        sc = SkyCoord(RA, DEC, frame='icrs')
        assert sc.frame_name == 'icrs'

        sc = SkyCoord(RA, DEC, frame=ICRS)
        assert sc.frame_name == 'icrs'

        sc = SkyCoord(RA, DEC, 'icrs')
        assert sc.frame_name == 'icrs'

>       sc = SkyCoord(RA, DEC, ICRS)

astropy/coordinates/tests/test_sky_coord.py:192: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <[RuntimeError("maximum recursion depth exceeded") raised in repr()] SafeRepr object at 0x106f706c8>
args = [<Quantity 1.0 deg>, <Quantity 2.0 deg>, <class 'astropy.coordinates.builtin_frames.ICRS'>]
kwargs = {}

    def __init__(self, *args, **kwargs):

        # Parse the args and kwargs to assemble a sanitized and validated
        # kwargs dict for initializing attributes for this object and for
        # creating the internal self._sky_coord_frame object
        args = list(args)  # Make it mutable
>       kwargs = self._parse_inputs(args, kwargs)

astropy/coordinates/sky_coordinate.py:79: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <[RuntimeError("maximum recursion depth exceeded") raised in repr()] SafeRepr object at 0x106e6eea8>
args = [<Quantity 1.0 deg>, <Quantity 2.0 deg>, <class 'astropy.coordinates.builtin_frames.ICRS'>]
kwargs = {}

    def _parse_inputs(self, args, kwargs):
        """
            Assemble a validated and sanitized keyword args dict for instantiating a
            SkyCoord and coordinate object from the provided `args`, and `kwargs`.
            """
        valid_kwargs = {}

        # Put the SkyCoord attributes like frame, equinox, obstime, location
        # into valid_kwargs dict.  `Frame` could come from args or kwargs, so
        # set valid_kwargs['frame'] accordingly.  The others must be specified
        # by keyword args or else get a None default.  Pop them off of kwargs
        # in the process.
>       frame = valid_kwargs['frame'] = _get_frame_name(args, kwargs)

astropy/coordinates/sky_coordinate.py:140: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

args = [<Quantity 1.0 deg>, <Quantity 2.0 deg>, <class 'astropy.coordinates.builtin_frames.ICRS'>]
kwargs = {}

    def _get_frame_name(args, kwargs):
        """
        Determine the coordinate frame from input SkyCoord args and kwargs.  This
        modifies args and/or kwargs in-place to remove the item that provided
        `frame`.  It also infers the frame if an input coordinate was provided and
        checks for conflicts.

        This allows for frame to be specified as a string like 'icrs' or a frame
        class like ICRS, but not an instance ICRS() since the latter could have
        non-default preferred attributes which would require a three-way merge.
        """
        frame = kwargs.pop('frame', None)

        if frame is not None:
            # Frame was provided as kwarg so validate and coerce into corresponding frame.
            frame_cls = _get_frame_class(frame)
            frame_name = frame_cls.name
        else:
            # Look for the frame in args
            for arg in args:
                try:
                    frame_cls = _get_frame_class(arg)
                except ValueError:
                    pass
                else:
                    frame_name = frame_cls.name
>                   args.remove(arg)
E                   DeprecationWarning: elementwise comparison failed; this will raise the error in the future.