eval {
        level2();
};
if($@) {
        print "Error $@";
        #want to print stack trace HERE!
}

sub level2
{
        print "This is level2\n";
        level3();
}

sub level3
{
        print "This is level3\n";

        $i = 0;
        while(($package, $filename, $line, $subroutine)=caller($i++)) {
                print "caller($i)=$package, $filename, $line, $subroutine\n";
                }

        $zero = 0;
        $zero = 100 / $zero;
}