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my $it3 = append (upto(1,3), list_iterator qw(foo bar baz), upto (7,9)
+);
print_it $it3;

Invalid append 1
$VAR1 = 1;
...
            use strict 'refs';
            return $start <= $end ? $start++ : undef;
        };

print "\n\nInvalid append 1\n";
my $it3 = append upto(1,3), list_iterator (qw(foo bar baz)), upto (7,9
+);
print_it $it3;

Invalid append 1
$VAR1 = 1;
...
$VAR1 = 7;
$VAR1 = 8;
$VAR1 = 9;