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  1. or download this
    # warn.pm
    package CORE::GLOBAL;
    ...
        CORE::warn @_;
         }; # die:
        1;
    
  2. or download this
    # warn.pl
    #!/usr/bin/perl
    ...
    use warn;
    
    warn "second warn";
    
  3. or download this
    first warn at warn.pl line 6.
    WARN 'second warn'!
    second warn at warn.pm line 9.