(F) You attempted to use a feature of printf that is accessible from
only C. This usually means there's a better way to do it in Perl.
-=item Use of %s is deprecated
-
-(D deprecated) The construct indicated is no longer recommended for use,
-generally because there's a better way to do it, and also because the
-old way has bad side effects.
-
=item Use of -l on filehandle%s
(W io) A filehandle represents an opened file, and when you opened the file