It's probably cause he's doing stuff he shouldn't be doing.

perl -Mstrict -w -MCGI -MCGI=*table -e 1

perl -Mstrict -w -MCGI::Carp -MCarp -e 1
[download]

The Carp does it cause has to perform magic. That is why you should use warnings;

perl -Mstrict -Mwarnings -MCGI::Carp -MCarp -e 1
[download]

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