@functools.singledispatch<EOL>@_call_with_selection<EOL>def get_ann_text(sel):
warnings.warn(<EOL>"<STR_LIT>".format(type(sel.artist)))<EOL>return "<STR_LIT>"<EOL>
Compute an annotating text for a `Selection` (passed **unpacked**).

This is a single-dispatch function; implementations for various artist
classes follow.