[Pyrex] Another lvalue cast bites the dust

[Greg Ewing]

Lenard Lindstrom wrote:

> I think there are only a few places where lvalue casts can appear. So 
> I will check them and make any necessary fixes.

Be careful while you're doing that. The reason some
of the lvalue casts appear is that in some places
I'm using the same methods to generate code for an
expression whether it appears on the left or the
right. So you need to take care that you're not
also affecting necessary casts on the rhs.

Greg