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> Bradd W. Szonye wrote: >> No, it's a flaw in the design. You distinguish lists from alists >> according to content. You'll have isomorphism problems whenever the >> content of a list happens to match the structure of an alist. The only >> way to avoid that is to eliminate support for primitive alists -- which >> means eliminating support for one of the most common Scheme collections. scgmille@xxxxxxxxxxxxxxxxxx wrote: > No we don't. Taylor can attest to that. That was a bug in the > implementation at the time, it wasn't a problem previous to that > version, and isn't a problem now. How do the generic procedures know whether '((a . 1) (b . 2)) is a list or an alist? If it's based on content, you have isomorphism issues to resolve. If you're now using something like a record type for alists, then you're not really handling primitive alists. -- Bradd W. Szonye http://www.szonye.com/bradd