> > One case can be 'almost-legal' : downcasting an object to its
implementation
> > class if you're sure that it has been previously upcasted to the
interface
> > type class.
> >
> And here is how to break your code:
>
> class c = object method a : unit end
> let i = new_intf (new c)
>

True.
In fact that sample can't be used if the class also use shadow types which
prevents the user from writing his own class and then making the program
crash.

Nicolas Cannasse

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