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require Carp;
Carp::croak "This will produce a compile time error.";
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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)]);