On Wed, Dec 14, 2016 at 10:01:27PM -0500, John Duncan wrote:
> This is because A still points at the cons that was the head of the list
> before sorting. If you want to update it, you have to set A to the result
> of sort.

Yes. The point is that 'sort' is a "destructive" operation. See the reference of
'sort'.

- Alex
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