I debugged this case and looked into the FTBFS of ruby-handlebas-assets. I checked out the upstream git repository and it tests just fine even when I raise the haml and rake gem versions to match the ones in Debian. But it fails with exactly the same error if I replace the javascript files in vendor/assets/javascript by the javascript files provided by libjs-handlebars. So there seems to be some incompatbility or difference with these files actually causing the build issue (and I don't believe it's the version difference of 4.7.2 vs 4.7.3).
Regards, Daniel
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