Armin Rigo - 2006-07-21

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user_id=4771 uses sys.exc_info() in a strange way to get
at the current frame. In particular, reading the f_back
attribute of frames is not supported in Psyco, which is
why it fails. A work-around is to prevent Psyco from
compiling traceback.print_stack() by adding the following
line after 'import psyco':