[racket] choice-evt: quadratic?

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Thu Dec 15 18:05:53 EST 2011

At Thu, 15 Dec 2011 15:56:51 -0500, Tony Garnock-Jones wrote:
> Converting a number of alternative events into a single event by folding 
> choice-evt over them one-at-a-time takes O(n^2) time.

Fix pushed.

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