Companion for paritytech/polkadot#7098 (#2469)

* Companion for paritytech/polkadot#7098

* Fixes

* Add missing benchmarked function

* Fix typo

* update lockfile for {"polkadot", "substrate"}

---------

Co-authored-by: parity-processbot <>

parachain-template/runtime/src/xcm_config.rs

@@ -5,20 +5,20 @@ use super::{
 use core::{marker::PhantomData, ops::ControlFlow};
 use frame_support::{
 	log, match_types, parameter_types,
-	traits::{ConstU32, Everything, Nothing},
+	traits::{ConstU32, Everything, Nothing, ProcessMessageError},
 	weights::Weight,
 };
 use frame_system::EnsureRoot;
 use pallet_xcm::XcmPassthrough;
 use polkadot_parachain::primitives::Sibling;
 use polkadot_runtime_common::impls::ToAuthor;
-use xcm::{latest::prelude::*, CreateMatcher, MatchXcm};
+use xcm::latest::prelude::*;
 use xcm_builder::{
 	AccountId32Aliases, AllowExplicitUnpaidExecutionFrom, AllowTopLevelPaidExecutionFrom,
-	CurrencyAdapter, EnsureXcmOrigin, FixedWeightBounds, IsConcrete, NativeAsset, ParentIsPreset,
-	RelayChainAsNative, SiblingParachainAsNative, SiblingParachainConvertsVia,
-	SignedAccountId32AsNative, SignedToAccountId32, SovereignSignedViaLocation, TakeWeightCredit,
-	UsingComponents, WithComputedOrigin,
+	CreateMatcher, CurrencyAdapter, EnsureXcmOrigin, FixedWeightBounds, IsConcrete, MatchXcm,
+	NativeAsset, ParentIsPreset, RelayChainAsNative, SiblingParachainAsNative,
+	SiblingParachainConvertsVia, SignedAccountId32AsNative, SignedToAccountId32,
+	SovereignSignedViaLocation, TakeWeightCredit, UsingComponents, WithComputedOrigin,
 };
 use xcm_executor::{traits::ShouldExecute, XcmExecutor};
 
@@ -108,7 +108,7 @@ where
 		message: &mut [Instruction<RuntimeCall>],
 		max_weight: Weight,
 		weight_credit: &mut Weight,
-	) -> Result<(), ()> {
+	) -> Result<(), ProcessMessageError> {
 		Deny::should_execute(origin, message, max_weight, weight_credit)?;
 		Allow::should_execute(origin, message, max_weight, weight_credit)
 	}
@@ -122,7 +122,7 @@ impl ShouldExecute for DenyReserveTransferToRelayChain {
 		message: &mut [Instruction<RuntimeCall>],
 		_max_weight: Weight,
 		_weight_credit: &mut Weight,
-	) -> Result<(), ()> {
+	) -> Result<(), ProcessMessageError> {
 		message.matcher().match_next_inst_while(
 			|_| true,
 			|inst| match inst {
@@ -136,7 +136,7 @@ impl ShouldExecute for DenyReserveTransferToRelayChain {
 				TransferReserveAsset {
 					dest: MultiLocation { parents: 1, interior: Here }, ..
 				} => {
-					Err(()) // Deny
+					Err(ProcessMessageError::Unsupported) // Deny
 				},
 				// An unexpected reserve transfer has arrived from the Relay Chain. Generally,
 				// `IsReserve` should not allow this, but we just log it here.