[FRAME] pallet_asset_tx_payment: replace AssetId bound from Copy to Clone (#7194)

closes #6911

Author: dastansam

prdoc/pr_7194.prdoc

@@ -0,0 +1,15 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: '[FRAME] `pallet_asset_tx_payment`: replace `AssetId` bound from `Copy` to `Clone`'
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      `OnChargeAssetTransaction`'s associated type `AssetId` is bounded by `Copy` which makes it impossible
+      to use `staging_xcm::v4::Location` as `AssetId`. This PR bounds `AssetId` to `Clone` instead, which is 
+      more lenient.
+
+crates:
+  - name: pallet-asset-tx-payment
+    bump: minor

substrate/frame/transaction-payment/asset-tx-payment/src/lib.rs

@@ -202,7 +202,7 @@ where
 		debug_assert!(self.tip <= fee, "tip should be included in the computed fee");
 		if fee.is_zero() {
 			Ok((fee, InitialPayment::Nothing))
-		} else if let Some(asset_id) = self.asset_id {
+		} else if let Some(asset_id) = self.asset_id.clone() {
 			T::OnChargeAssetTransaction::withdraw_fee(
 				who,
 				call,
@@ -233,7 +233,7 @@ where
 		debug_assert!(self.tip <= fee, "tip should be included in the computed fee");
 		if fee.is_zero() {
 			Ok(())
-		} else if let Some(asset_id) = self.asset_id {
+		} else if let Some(asset_id) = self.asset_id.clone() {
 			T::OnChargeAssetTransaction::can_withdraw_fee(
 				who,
 				call,
@@ -358,7 +358,7 @@ where
 					tip,
 					who,
 					initial_payment,
-					asset_id: self.asset_id,
+					asset_id: self.asset_id.clone(),
 					weight: self.weight(call),
 				})
 			},

substrate/frame/transaction-payment/asset-tx-payment/src/payment.rs

@@ -40,7 +40,7 @@ pub trait OnChargeAssetTransaction<T: Config> {
 	/// The underlying integer type in which fees are calculated.
 	type Balance: Balance;
 	/// The type used to identify the assets used for transaction payment.
-	type AssetId: FullCodec + Copy + MaybeSerializeDeserialize + Debug + Default + Eq + TypeInfo;
+	type AssetId: FullCodec + Clone + MaybeSerializeDeserialize + Debug + Default + Eq + TypeInfo;
 	/// The type used to store the intermediate values between pre- and post-dispatch.
 	type LiquidityInfo;
 
@@ -112,7 +112,7 @@ where
 	T: Config,
 	CON: ConversionToAssetBalance<BalanceOf<T>, AssetIdOf<T>, AssetBalanceOf<T>>,
 	HC: HandleCredit<T::AccountId, T::Fungibles>,
-	AssetIdOf<T>: FullCodec + Copy + MaybeSerializeDeserialize + Debug + Default + Eq + TypeInfo,
+	AssetIdOf<T>: FullCodec + Clone + MaybeSerializeDeserialize + Debug + Default + Eq + TypeInfo,
 {
 	type Balance = BalanceOf<T>;
 	type AssetId = AssetIdOf<T>;
@@ -133,11 +133,14 @@ where
 		// less than one (e.g. 0.5) but gets rounded down by integer division we introduce a minimum
 		// fee.
 		let min_converted_fee = if fee.is_zero() { Zero::zero() } else { One::one() };
-		let converted_fee = CON::to_asset_balance(fee, asset_id)
+		let converted_fee = CON::to_asset_balance(fee, asset_id.clone())
 			.map_err(|_| TransactionValidityError::from(InvalidTransaction::Payment))?
 			.max(min_converted_fee);
-		let can_withdraw =
-			<T::Fungibles as Inspect<T::AccountId>>::can_withdraw(asset_id, who, converted_fee);
+		let can_withdraw = <T::Fungibles as Inspect<T::AccountId>>::can_withdraw(
+			asset_id.clone(),
+			who,
+			converted_fee,
+		);
 		if can_withdraw != WithdrawConsequence::Success {
 			return Err(InvalidTransaction::Payment.into())
 		}
@@ -167,7 +170,7 @@ where
 		// less than one (e.g. 0.5) but gets rounded down by integer division we introduce a minimum
 		// fee.
 		let min_converted_fee = if fee.is_zero() { Zero::zero() } else { One::one() };
-		let converted_fee = CON::to_asset_balance(fee, asset_id)
+		let converted_fee = CON::to_asset_balance(fee, asset_id.clone())
 			.map_err(|_| TransactionValidityError::from(InvalidTransaction::Payment))?
 			.max(min_converted_fee);
 		let can_withdraw =