I'm trying to stack up several abstract base classes, but apparently
that doesn't fit the current type system. Is there another way to do
this :

class virtual a = object
 method virtual x : int
end

class virtual b = object
 inherit a as super
 method x = pred super#x
end

Without getting this:

$ ocamlc /tmp/x.ml
File "/tmp/x.ml", line 7, characters 17-22:
This expression has no method x

(using OCaml 3.02)
--f
François Rouaix
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