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Re: cyclic



>>A simple circular list does not behave as expected when an element
>>of the list is modified (since ref "makes a new object and returns

why expect that `an element of the list is modified' and `ref "makes a new
object"'
are not orthogonal ideas (in an algol68 sort of way)?
and, in fact, you can assign
	foo.link = bar;
and
	bar.link = foo;
quite happily, provided you've declared link as cyclic.
of course, if you say `ref', then ref `makes a new object'.
call me a taxi!