die throws an exception, and eval traps it. Error string is found in $@. The following code has the possibility of two run-time errors:
$c = $a / $b; #1
die "Denominator cannot be negative" if ($b < 0); #2
print "Run-time error: $@";
$@ can be "Illegal division by zero" at (1) or "Denominator cannot be negative" at (2).
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