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Date: Fri, 18 Sep 2009 15:51:57 -0400 From: David Van Horn <dvanhorn@xxxxxxxxxxxxxxx> In a system that uses random-access lists everywhere, you would not need conversions. In a system that doesn't, these are easy to portably define. So now I'm not sure what your concern is. I want to be able to write portable programs that can take advantage of systems with only random-access lists, but that can run on other systems as well by converting between sequential lists and random- access lists. `Take advantage' here means using identity conversions. Of course I can define copying conversions portably and use those, but that wouldn't take advantage of systems whose lists are all random-access.