Deriving Excitement

[David Feuer]

I would just like to note that the code fragment I sent in 
that SPJ refers to is actually only a slightly modified 
version of some datatypes from Okasaki's paper on square 
matrices.  Just to give credit where credit is due...  I 
didn't bother to mention this when I sent it in because it 
was just in the context of a bug report on GHC's handling 
of this declaration.

David Feuer

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