In this case, cat outputs its own error with what would be $!.
cat: file-that-does-not-exist: No such file or directory
It might be cleaner to "exit 1 if $?" rather than die to avoid the useless "Died" message (but then you don't get the line number).
Update: Hmmm, when I hit 'reply', the node I replied to said only, Do you deem "Died at x.pl line y." acceptable?
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