perllexwarn

       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.

perl v5.22.1                      2018-11-19                    PERLLEXWARN(1)
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