[pypy-dev] special methods

[Simon Burton]

The attached script is an attempt to get __str__ to work in rpython.
After annotation, it looks for str(someinstance), rewriting the block to call __str__.
Then the modified blocks are fed back into the annotator.

It seems to work. (And now i know a lot more about the internals of the translation process...)

I had a think about over-riding consider_op_str. It would seem natural for this code
to go there, but the annotator is not really set up to handle rewriting.

Why do i not need to manually call the flow operation on the __str__ ? (see the flow_str function) 
It seems the annotator somehow must re-trigger the flowing operation when it
finds that __str__ is being called.

thanks,

Simon.
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