>It's exactly similar to value definitions: put a ``and'' between the
>two recursive definitions.
>type foo = B of bar
>and bar = F of foo

Ah, thanks!  Is there any way to do it without the "and"?  In other words, what if I want to do this but the types are defined "far away" from each other in the source.  The "and" solution works, but I'm looking for something like forward declarations from C++:

class foo;
class bar;
class foo { bar *Bar; };
// ...lots of stuff...
class bar { foo *Foo; };

Chris