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#!/usr/bin/perl
use warnings;
...
my $s = 'MyStruct'->new(fields => { a => 0, b => 1 });
$s->fields->{b}++;
print $s->fields->{b};

#!/usr/bin/perl
use warnings;
...
my $s = 'MyStruct'->new(fields => { a => 0, b => 1 });
$s->set_fields(b => $s->get_fields('b') + 1);
print $s->get_fields('b');

($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,