[Pyrex] Newbie shreeks for help?

[Robin Becker]

I'm a newbie with pyrex, but I can't see what I'm doing wrong in the
code below, I get errors 
_tex_wrap.c(640) : error C2065: 'None' : undeclared identifier
_tex_wrap.c(640) : error C2100: illegal indirection
_tex_wrap.c(648) : error C2100: illegal indirection
error: command '"C:\Program Files\Microsoft Visual
Studio\VC98\BIN\cl.exe"' failed with exit status 2

But I'm not using None anywhere.
I think the error comes from inheriting from class _Box. At the
indicated lines I see stuff like

 __pyx_vtable_9_tex_wrap_Box.__pyx_base = *None;

but I don't see a definition of None in the c code.



################################################
cdef class _Box:
    cdef readonly int penalty, flagged, is_glue, is_penalty, is_box
    cdef char* character
    cdef double width, stretch, shrink

cdef class Box(_Box):
    """Class representing a glyph or character.  Boxes have a fixed
    width that doesn't change.
    """
    cdef __init__(self, double width, char* character):
        self.character = character
        self.width = width
        self.stretch = self.shrink = self.penalty = self.flagged =
self.is_glue = self.is_penalty = 0
        self.is_box = 1

cdef class Glue(_Box):
    """Class representing a bit of glue.  Glue has a preferred width,
    but it can stretch up to an additional distance, and can shrink
    by a certain amount.  Line breaks can be placed at any point where
    glue immediately follows a box.
    """
    cdef __init__(self, double width, double stretch, double shrink):
        self.width = width
        self.stretch = stretch
        self.shrink = shrink
        self.is_glue = 1
        self.is_box = self.is_penalty = 0

    cdef compute_width(self, double r):
        """Return how long this glue should be, for the given adjustment
        ratio r."""
        if r < 0:   return self.width + r*self.shrink
        else:       return self.width + r*self.stretch
-- 
Robin Becker