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my ($hashref, $arrayref, @array) = new();
print $hashref->{'a'};
...
    my $arrayref = [4,5];
    return ($hashref, $arrayref, @array);
}

## $arrayref isn't defined!
my ($hashref, @array, $arrayref) = new();
...
    my $arrayref = [4,5];
    return ($hashref, @array, $arrayref);
}