Any version of ruby2ruby later than 1.2.2 causes a 'translate' error in heckle.
fix ruby2ruby dependency, later versions break heckle
The dependency must be fixed. See the difference between 1.2.2 and 1.3.1 in this gist
This should be fixed in master or on my ruby_parser branch, and will be available in a forthcoming heckle 2.0 release.