private class ExternClassesTypingPhaseModel
	super Phase

	redef fun process_nclassdef(nclassdef)
	do
		if not nclassdef isa AStdClassdef then return

		var mclassdef = nclassdef.mclassdef
		if mclassdef == null then return
		var mclass = mclassdef.mclass

		# We only need to do this once per class
		if not mclassdef.is_intro then return

		if mclass.kind != extern_kind then return

		mclass.compute_ftype(self)
	end
end