While I think that you have stumbled onto an undesirable behavior in CGI::Carp, the bug causing your script to die in the first place is still.... within your script.

However, that said, here's an interesting observation:

With CGI::Carp.....

use CGI::Carp;
eval { die "Ouch!" };
print $@, "\n";
__OUTPUT__
Ouch at C:/Perl/lib/CGI/Carp.pm line 312.
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With Carp.pm.....

use Carp;
eval { die "Ouch" };
print $@, "\n";
__OUTPUT__
Ouch at C:\Perl\scripts\mytest.pl line 6.
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And with CORE::die()....

<p>
eval { CORE::die "Ouch" }
print $@, "\n";
__OUTPUT__
Ouch at C:\Perl\scripts\mytest.pl line 5.
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The documentation for CGI::Carp says that in the realm of CGI scripts, you can simply replace "use Carp;" with "use CGI::Carp;". You've discovered that it's not quite that simple... their behavior with respect to reporting a fatal that occurred inside an eval is not uniform.