[plt-scheme] HtDP assf function missing

Ignore it and for exercises that might use it write your own two lines. 


On Feb 16, 2010, at 7:12 PM, Gadfly wrote:

> FYI --
> 
> The assf function, which HtDP section 43.2 calls for to develop
> 'lookup-node', is missing from language "HtDP advanced student."
> 
> I tried saving --
> 
> #lang scheme
> (provide assf)
> 
> -- as a module file and adding it as a teachpack, but that didn't
> work.
> 
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