C<taint>, C<pos>).
If C<setmagic> is false then no set magic will be called on the new (empty) SV.
-This typically means that assignment will soon follow (e.g. C<'local $x = $y'>),
+This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
and that will handle the magic.
=cut