Talk:Void-safe migration guide

--Ericb 14:34, 2 August 2009 (UTC)': The problem about not having `default_create' as creation procedure in CELL anymore, even when the actual generic parameter is detachable, is not just an expandedness issue. What do we do with code like that:

class A [G -> ANY create default_create end]
...
end
 
a: A [CELL [detachable FOO]]

--manus 18:27, 3 August 2009 (UTC): Of course here you have not much choice and you either have to rewrite `A' and/or define a new CELL class that has default_create as a creation procedure. The real question is how much of this code actually exists and the impact of rewriting the code that depended on that. Another solution is to modify `default_create' in ANY to have a precondition re-definable by descendants so to leave your code unchanged, in this case `CELL' would say it is ok to use default_create but only when the actual generic parameter is detachable.