redef fun unbox_signature_extern(m, args)
	do
		var msignature = m.msignature.resolve_for(m.mclassdef.bound_mtype, m.mclassdef.bound_mtype, m.mclassdef.mmodule, true)
		if not m.mproperty.is_init and m.is_extern then
			args.first = self.unbox_extern(args.first, m.mclassdef.mclass.mclass_type)
		end
		for i in [0..msignature.arity[ do
			var mp = msignature.mparameters[i]
			var t = mp.mtype
			if mp.is_vararg then
				t = args[i+1].mtype
			end
			if m.is_extern then args[i+1] = self.unbox_extern(args[i+1], t)
		end
	end

	redef fun unbox_signature_extern(m, args)
	do
		var recv = args.first
		for i in [0..m.msignature.arity[ do
			var mp = m.msignature.mparameters[i]
			var t = mp.mtype
			if mp.is_vararg then
				t = args[i+1].mtype
			end
			t = self.resolve_for(t, recv)
			if m.is_extern then args[i+1] = self.unbox_extern(args[i+1], t)
		end
	end