Perhaps something like:
use feature ":5.14";
use warnings FATAL => qw(all);
use strict;
use Data::Dump qw(dump pp);
use Test::More qw(no_plan);
sub deref(@)
{my $h = shift;
for(@_)
{return undef unless $h and ref($h) eq __PACKAGE__ and $h->can($_);
$h = $h->$_;
}
$h
}
my $h = bless {a=>bless{a=>bless{a=>bless{a=>1, b=>2}}}};
sub aaa() {$_[0]->{a}}
sub bbb() {$_[0]->{b}}
ok !defined($h->deref(qw(bbb bbb bbb bbb)));
ok 1 == $h->deref(qw(aaa aaa aaa aaa));
ok 2 == $h->deref(qw(aaa aaa aaa bbb));
Produces
ok 1
ok 2
ok 3
1..3
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