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  1. or download this
    #!/usr/bin/perl -w
    
    BEGIN {
    ...
      use Carp qw(verbose confess); #die verbosely, with stacktraces
      $SIG{__WARN__} = \&confess;   #die, on warnings
    }
    
  2. or download this
    #!/usr/bin/perl -w
    
    use strict;
    use Carp qw(verbose confess);
    $SIG{__WARN__} = \&confess;