@property<EOL><INDENT>def source(self):<DEDENT>
assert False, '<STR_LIT>'<EOL>
Returns the source code of the Python object `obj` as a list of
lines. This tries to extract the source from the special
`__wrapped__` attribute if it exists. Otherwise, it falls back
to `inspect.getsourcelines`.

If neither works, then the empty list is returned.