Puppet users - Dec 2013 - Error: Puppet::Parser::AST::Resource failed with error Hiera::InterpolationLoop: Detected in [::environment]

Hello,

just upgraded Hiera from ver. 1.2.1 to 1.3.0 and broke our puppet 
environment. :)
It seems that there are sizeable changes related to variable interpolation

Here is an error during Puppet run:


Error: Puppet::Parser::AST::Resource failed with error 
Hiera::InterpolationLoop: Detected in [::environment] at 
/home/ubuntu/environments/project_dev/manifests/site.pp:35 on node 
project-dev.novalocal
Wrapped exception:
Detected in [::environment]
Error: Puppet::Parser::AST::Resource failed with error 
Hiera::InterpolationLoop: Detected in [::environment] at 
/home/ubuntu/environments/project_dev/manifests/site.pp:35 on node 
project-dev.novalocal
Error: Puppet::Parser::AST::Resource failed with error 
Hiera::InterpolationLoop: Detected in [::environment] at 
/home/ubuntu/environments/project_dev/manifests/site.pp:35 on node 
project-dev.novalocal


Line 35 in the above manifest contains the line

class { "apache": }

as we''re using a standard module apache from Puppetlabs to manage an 
installation of Apache.

And here is our hiera.yaml
---
:backends:
  - yaml
:hierarchy:
  - private/%{::environment}/%{::clientcert}
  - public/%{::environment}/%{::clientcert}
  - private/%{::environment}/%{::environment}
  - public/%{::environment}/%{::environment}
  - public/%{::environment}/%{::operatingsystem}
  - public/%{::environment}/common
:yaml:
  :datadir: ''/etc/puppet/hieradata/''


Any ideas how to fix the issue? Thanks.

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