[plt-scheme] HtDP 26.1.2

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Sun Mar 22 18:13:08 EDT 2009

On Mar 22, 2009, at 5:52 PM, David Yrueta wrote:

> I considered this design possibility earlier because it seems to  
> work, but I'd be shocked if it was right.  It violates too many of  
> conditions of the design recipe by 1) including a possible value  
> for a-lolon that doesn't exist in it's data definition, and, 2) not  
> using merge-all-neighbors to recur on (merge (first a-lolon) (first  
> (rest a-lolon))).

But why should it? It's mostly what you want. You're missing a  
clause, and one additional well-chosen test should reveal this. 
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