What's wrong with this code? When I try to compile it using ocamlc
3.06 the compiler hangs on Win32 and on Debian Linux as well. The
ocaml interpreter does the same.

It works when I changed Oo.copy self to {<>} or simply self.

class virtual duplicatable =
  object (_ : 'a)
    method virtual dup : 'a
  end

class test =
  object (self)
    inherit duplicatable
    method dup = Oo.copy self
  end

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