Lexing error being thrown causes Segmentation Fault

I have a simple calculator written in RPython. If a lexing error is thrown, the program segfaults. It works fine under CPython and PyPy, however. Furthermore, if after a valid token, there is an invalid token, the invalid token and everything that follows it is completely ignored, rather than throwing a ParsingError.

The problem only occurs with RPython. I have the latest checkout(i.e. I just updated it right now).

Example:


I am on Ubuntu Precise.