It's not a question of lack of access. You wrap the function that gets the value to assign to "n", which means the value hasn't been assigned to "n" yet.
$self->{n} = sub {
my ($self) = @_;
my $rv = $self->do_n();
$self->do_n2();
return $rv;
}->();
Now sure how to fix your problem since you didn't specify what you wanted to do. Perhaps
#!/usr/bin/perl -w
use strict;
{
package Test;
use Mouse;
has 'n' => ( is => 'rw', isa => 'Int', default => 3 );
has 'n2' => ( is => 'rw', isa => 'Int', lazy => 1,
default => sub { $_[0]->n + 1 } );
__PACKAGE__->meta->make_immutable();
}
my $test = Test->new();
print($test->n, "\n"); # 3
print($test->n2, "\n"); # 4
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