So after an embarrassing amount of time debugging, I've finally stripped this issue ([http://stackoverflow.com/questions/4621589/perl-moose-typedecorator-error-how-do-i-debug][1]) down to a simple test case. I would humbly request some help understanding why it's failing :) Here is the error message I'm getting:

plxc16479> $h2/tmp/tmp18.pl This method [new] requires a single argument. at /nfs/pdx/disks/nehalem.pde.077/perl/5.12.2/lib64/site_perl/MooseX/Types/TypeDecorator.pm line 91

MooseX::Types::TypeDecorator::new('MooseX::Types::TypeDecorator=HASH(0x655b90)') called at /nfs/pdx/disks/nehalem.pde.077/projects/lib/Program-Plist-Pl/lib/Program/Plist/Pl.pm line 10

Program::Plist::Pl::BUILD('Program::Plist::Pl=HASH(0x63d478)', 'HASH(0x63d220)') called at generated method (unknown origin) line 29

Program::Plist::Pl::new('Program::Plist::Pl') called at /nfs/pdx/disks/nehalem.pde.077/tmp/tmp18.pl line 10

Wrapper test script:

use strict;
use warnings;

BEGIN {push(@INC, split(':', $ENV{PERL_TEST_LIBS}))};

use Program::Plist::Pl;

my $obj = Program::Plist::Pl->new();

Program::Plist::Pl file:

package Program::Plist::Pl;

use Moose;
use namespace::autoclean;

use Program::Types qw(Pattern); # <-- Removing this fixes error
use Program::Plist::Pl::Pattern;

sub BUILD {
  my $pattern_obj = Program::Plist::Pl::Pattern->new();
}

__PACKAGE__->meta->make_immutable;

1;

Program::Types file:

package Program::Types;

use MooseX::Types -declare => [qw(Pattern)];

class_type Pattern, {class => 'Program::Plist::Pl::Pattern'};

1;

And the Program::Plist::Pl::Pattern file:

package Program::Plist::Pl::Pattern;

use Moose;
use namespace::autoclean;

__PACKAGE__->meta->make_immutable;

1;

Notes: While I don't need the Pattern type from Program::Types in the above code, I do in other code that is stripped out. The PERL_TEST_LIBS env var I'm pulling INC paths from only contains paths to the project modules. There are no other modules loaded from these paths.

It appears the MooseX::Types definition for Pattern is causing problems, but I'm not sure why. Documentation shows the syntax I am using, but it's possible I'm misusing class_type as there isn't much said about it. Intent is to be able to use Pattern for type checking via MooseX::Params::Validate to verify the argument is a 'Program::Plist::Pl::Program' object.

I've found that removing the intervening class Program::Plist::Pl from the equation by directly calling Pattern->new from the tmp18.pl wrapper results in no error, even when the Program::Types Pattern type is imported.