]> Here's something I've wondered about for a while and just encountered again. How come this class .. class virtual ['a] c = object method virtual b: bool c end ... gets a constraint 'a = bool? I.e. for instance this doesn't compile: class virtual ['a] c = object method virtual b: bool c method virtual i: int c (* "This type int should be an instance of type bool" *) end Note that the following does work in C++: template <class a> struct c { virtual c<bool> b() = 0; virtual c<int> i() = 0; }; I guess there are workarounds but it seems unnecessary that ML should find recursive parameterised classes harder than C++? ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners