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  1. or download this
     
    require Carp;
    Carp::croak "This will produce a compile time error.";
    
  2. or download this
     
    use Carp;
    Carp::croak "This will compile fine.";
    
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    use warnings;
    require Carp;
    Carp::croak "And so will this.";
    
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    require Data::Dumper;
    print Data::Dumper::Dumper([qw(This is good too)]);