I'm now sure, that this bug is caused by changes between Ruby 1.8.7.72 and 1.8.7.174, which produce a problem with libparsetree-ruby. The latest upstream version of libparsetree would help, but it would introduce a new package.
Packaging sexp_processor, which was split off from ParseTree seems to be an easy task. Unfortunately the latest ParseTree fails to pass all it's tests and it's not very easy to track these problems down. I decided, that if I update libparsetree-ruby, than it must be done right and all tests should pass. Until then, I'm going to simply fix the current version in Debian (See #536437). Tobias
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