perllexwarn1
Perl lexical warnings
Overview
Perl v5.6.0 introduced lexical control over the handling of warnings by category. The "warnings" pragma generally replaces the command line flag -w. Documentation on the use of lexical warnings, once partly found in this document, is now found in the warnings documentation.
Releases
12 releases since Debian 3.0 (Woody); the text changed 11 times.
-W until Debian 7 (Wheezy);
-X until Debian 7 (Wheezy);
-w until Debian 7 (Wheezy).