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

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Fri Jan 4 18:55:31 EST 2013

On Jan 4, 2013, at 6:35 PM, Jens Axel Søgaard wrote:

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

That is the key problem. 

Posted on the dev mailing list.