any use of the returned pointer. It is the caller's responsibility to
ensure that it knows which of these situations applies.
+=for apidoc newATTRSUB
+Construct a Perl subroutine, also performing some surrounding jobs.
+
+This is the same as L<perlintern/C<newATTRSUB_x>> with its C<o_is_gv> parameter set to
+FALSE. This means that if C<o> is null, the new sub will be anonymous; otherwise
+the name will be derived from C<o> in the way described (as with all other
+details) in L<perlintern/C<newATTRSUB_x>>.
+
+=for apidoc newSUB
+Like C<L</newATTRSUB>>, but without attributes.
+
=cut
*/