How do you include module Bar inside module Foo 
so you can load Foo as a Dynlink plugin (for camlp4)?  
I tried adding a line in Foo.ml that says

> module Bar = struct include Bar end

but camlp4 still didn't like it:

> Camlp4: Uncaught exception: DynLoader.Error
> ("Foo.cmo", "error while linking Foo.cmo.
> Reference to undefined global `Bar'")

And of course just adding Bar to Foo.cma
didn't work either.