perllexwarn - Man Page
Perl Lexical Warnings
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.
2023-05-16 perl v5.36.1 Perl Programmers Reference Guide