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  1. or download this
    class Interval {
    has Real $.lb is rw = die 'Lower bound is required';
...
say $i.perl;
$i.lb = 6;     # should blow up!
say $i.perl;
  2. or download this
    class Interval {
    has Real $.lb = die 'Lower bound is required';
...
        ($!lb, $!ub) = ($lb, $ub);
    }
}
  3. or download this
    class Interval {
    has Real $.lb = die 'Lower bound is required';
...
        $!ub = $ub;
    }
}