Export lists in modules

[Johannes Waldmann]

Cale Gibbard wrote:

> important point is that the elements and structure of the collection
> are being constructed one at a time as you iterate over it, and they
> are easily garbage collected as soon as you're done with them. 

OK, I kind of buy that argument. Though the very word "deforestation"
indicates that it might work for structures other than left-biased lists...
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