Is something like this what you want?
use strict;
use warnings;
use feature 'say';
{
package Tree;
use Moose;
has health_level => (
is => 'rw',
isa => 'Int',
);
sub grow_leaf {
my $self = shift;
Leaf->new(tree => $self); # pass $self on to child
}
}
{
package Leaf;
use Moose;
has tree => (
is => 'bare',
handles => ['health_level'],
);
}
my $t = Tree->new(health_level => 100);
my $l = $t->grow_leaf;
say $l->health_level; # 100
$t->health_level(90);
say $l->health_level; # 90
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