Controller.pm

package Lace::Test::Controller::Root;

use Moose;
use MooseX::MethodAttributes;

extends 'Catalyst::Controller';

sub root :Chained(/) PathPart('') CaptureArgs(0) { }

  sub part1 :Chained(root) { }

    sub part2 :Chained(part1) { }


__PACKAGE__->meta->make_immutable;

__END__

[debug] Loaded Chained actions:
.-------------------------------------------------------+-------------------------------------------------------.
| Path Spec                                             | Private                                               |
+-------------------------------------------------------+-------------------------------------------------------+
| /part1/...                                            | /root (0)                                             |
|                                                       | => /part1 (...)                                       |
| /part1/part2/...                                      | /root (0)                                             |
|                                                       | -> /part1 (0)                                         |
|                                                       | => /part2 (...)                                       |
'-------------------------------------------------------+-------------------------------------------------------'

even worse

package Lace::Test::Controller::Root;

use Moose;
use MooseX::MethodAttributes;

extends 'Catalyst::Controller';

sub root :Chained(/) PathPart('') CaptureArgs(0) { }

sub part1 :Chained(root) Args(1) { }

sub part2 :Chained(part1) { }

PACKAGE->meta->make_immutable;

END

[debug] Loaded Chained actions:
.-------------------------------------------------------+-------------------------------------------------------.
| Path Spec | Private |
+-------------------------------------------------------+-------------------------------------------------------+
| /part1/* | /root (0) |
| | => /part1 (1) |
| /part1/part2/... | /root (0) |
| | -> /part1 (0) |
| | => /part2 (...) |
'-------------------------------------------------------+-------------------------------------------------------'

you can see the whole 'midpoint can be an endpoint' gets really confused when you declare Args(1). you get an endpoint with Args(1) AND a midpoint with CaptureArgs(0)