puppetlabs/puppet — pull request #3175 by vinzent (2014-10-10 06:10:56+00:00)
Title: Add the key 'calling_class_path' 

calling_class_path is calling_class with :: replaced by a /

This enables to have the class hiera yaml files in directories and enables to have class based hiera data on windows which does not allow ":" in path names.