perllexwarn - Perl Lexical Warnings
=head1 DESCRIPTION
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The C<use warnings> pragma is a replacement for both the command line
flag B<-w> and the equivalent Perl variable, C<$^W>.
lexical warnings and C<$^W>, this section will describe how they interact.
How Lexical Warnings interact with B<-w>/C<$^W>:
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=over 5
=item 1.