eval sets "$@" with the output of what you'd normally see perl output if there were errors compiling your program.
perl normally wouldn't display runtime errors if a subroutine doesn't do what it is supposed
to do.
eval won't either.
If the routines you are running return a status, then you want to catch that status coming back
from eval:
my $status = eval "3+4";
$status should be '7'.
Only if the code you are executing "dies"
or throws a warning, in the perl sense, would eval return something in $@.
Does that help?
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