I want to create a class that reads in simple yaml config files, based on an argument.

With MooseX::SimpleConfig I want the path to be constructed from the argument and some base path already known. However, it seems the role Attribute '+configfile' cannot be made lazy and is always being created before anything else:

#!/usr/bin/perl 
package My::Config;

use Moose;
with 'MooseX::SimpleConfig';

has filename   =>  ( is  => 'ro', isa => 'Str', required => 1, );

has '+configfile' => (
    default => sub { my $self = shift; '/some/path/' . $self->filename
+ . ".yaml"; },
    lazy    => 1,
);

my $config = My::Config->new_with_config( filename => "config");
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Can't call method "filename" on an undefined value at ./myconf3.pl line 11.