Replace () filter with Nothing (#3665)

* replace `()` filter with `Nothing`

* import nothing

* add nothing

* update Substrate

Co-authored-by: parity-processbot <>

polkadot/xcm/xcm-builder/tests/mock/mod.rs

@@ -14,7 +14,11 @@
 // You should have received a copy of the GNU General Public License
 // along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
 
-use frame_support::{construct_runtime, parameter_types, traits::Everything, weights::Weight};
+use frame_support::{
+	construct_runtime, parameter_types,
+	traits::{Everything, Nothing},
+	weights::Weight,
+};
 use sp_core::H256;
 use sp_runtime::{testing::Header, traits::IdentityLookup, AccountId32};
 use sp_std::cell::RefCell;
@@ -173,7 +177,7 @@ impl pallet_xcm::Config for Runtime {
 	type XcmRouter = TestSendXcm;
 	// Anyone can execute XCM messages locally...
 	type ExecuteXcmOrigin = xcm_builder::EnsureXcmOrigin<Origin, LocalOriginToLocation>;
-	type XcmExecuteFilter = ();
+	type XcmExecuteFilter = Nothing;
 	type XcmExecutor = XcmExecutor<XcmConfig>;
 	type XcmTeleportFilter = Everything;
 	type XcmReserveTransferFilter = Everything;