[racket-dev] case-> and for/sum:

2013/1/4 Neil Toronto <neil.toronto at gmail.com>:
> I gave `for/sum:' a little thought recently, though, and I couldn't think of
> how to make it work without annotations. Maybe you'll have more success. I'm
> less motivated to fix `for/sum:' than you are. :D

Here is my attempt. The only problem, is that when type checking
fails, the set! expression is blamed instead of user code.

/Jens Axel
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