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  1. or download this
    #!/usr/bin/perl
use warnings;
...

$o->finalize;
$o->x(13);  # x is a read-only accessor
  2. or download this
    {   package MyRole;
    use Moo::Role;
    requires 'x';
    before x => sub { die "x is read only" if @_ > 1 };
}
  3. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,