I don't know how you might directly get what you want, but here's one
way to get an equivalent result.
class element_aux (c : [`Data of string | `Element of element list]) =
object end
type content = Data of string | Element of element list;;
let content_of_variant = function Data d -> `Data d | Element e ->
`Element e
class element (c : content) = element_aux (content_of_variant c)
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