Convert OutboundHTLCOutcome::Success fields to struct

diff --git a/lightning/src/ln/channel.rs b/lightning/src/ln/channel.rs
index 8e40061..5279cff 100644
--- a/lightning/src/ln/channel.rs
+++ b/lightning/src/ln/channel.rs
@@ -353,11 +353,11 @@ impl From<&OutboundHTLCState> for OutboundHTLCStateDetails {
 			// the state yet.
 			OutboundHTLCState::RemoteRemoved(_) =>
 				OutboundHTLCStateDetails::Committed,
-			OutboundHTLCState::AwaitingRemoteRevokeToRemove(OutboundHTLCOutcome::Success(_, _)) =>
+			OutboundHTLCState::AwaitingRemoteRevokeToRemove(OutboundHTLCOutcome::Success{..}) =>
 				OutboundHTLCStateDetails::AwaitingRemoteRevokeToRemoveSuccess,
 			OutboundHTLCState::AwaitingRemoteRevokeToRemove(OutboundHTLCOutcome::Failure(_)) =>
 				OutboundHTLCStateDetails::AwaitingRemoteRevokeToRemoveFailure,
-			OutboundHTLCState::AwaitingRemovedRemoteRevoke(OutboundHTLCOutcome::Success(_, _)) =>
+			OutboundHTLCState::AwaitingRemovedRemoteRevoke(OutboundHTLCOutcome::Success{..}) =>
 				OutboundHTLCStateDetails::AwaitingRemoteRevokeToRemoveSuccess,
 			OutboundHTLCState::AwaitingRemovedRemoteRevoke(OutboundHTLCOutcome::Failure(_)) =>
 				OutboundHTLCStateDetails::AwaitingRemoteRevokeToRemoveFailure,
@@ -392,9 +392,9 @@ impl OutboundHTLCState {
 	#[rustfmt::skip]
 	fn preimage(&self) -> Option<PaymentPreimage> {
 		match self {
-			OutboundHTLCState::RemoteRemoved(OutboundHTLCOutcome::Success(preimage, _))
-			| OutboundHTLCState::AwaitingRemoteRevokeToRemove(OutboundHTLCOutcome::Success(preimage, _))
-			| OutboundHTLCState::AwaitingRemovedRemoteRevoke(OutboundHTLCOutcome::Success(preimage, _)) => {
+			OutboundHTLCState::RemoteRemoved(OutboundHTLCOutcome::Success{preimage, ..})
+			| OutboundHTLCState::AwaitingRemoteRevokeToRemove(OutboundHTLCOutcome::Success{preimage, ..})
+			| OutboundHTLCState::AwaitingRemovedRemoteRevoke(OutboundHTLCOutcome::Success{preimage, ..}) => {
 				Some(*preimage)
 			},
 			_ => None,
@@ -407,14 +407,17 @@ impl OutboundHTLCState {
 enum OutboundHTLCOutcome {
 	/// We started always filling in the preimages here in 0.0.105, and the requirement
 	/// that the preimages always be filled in was added in 0.2.
-	Success(PaymentPreimage, Option<AttributionData>),
+	Success {
+		preimage: PaymentPreimage,
+		attribution_data: Option<AttributionData>,
+	},
 	Failure(HTLCFailReason),
 }
 
 impl<'a> Into<Option<&'a HTLCFailReason>> for &'a OutboundHTLCOutcome {
 	fn into(self) -> Option<&'a HTLCFailReason> {
 		match self {
-			OutboundHTLCOutcome::Success(_, _) => None,
+			OutboundHTLCOutcome::Success { .. } => None,
 			OutboundHTLCOutcome::Failure(ref r) => Some(r),
 		}
 	}
@@ -4604,10 +4607,10 @@ where
 			.pending_outbound_htlcs
 			.iter()
 			.filter(|OutboundHTLCOutput { state, .. }| match (state, local) {
-				(OutboundHTLCState::RemoteRemoved(Success(_, _)), true) => true,
-				(OutboundHTLCState::RemoteRemoved(Success(_, _)), false) => false,
-				(OutboundHTLCState::AwaitingRemoteRevokeToRemove(Success(_, _)), _) => true,
-				(OutboundHTLCState::AwaitingRemovedRemoteRevoke(Success(_, _)), _) => true,
+				(OutboundHTLCState::RemoteRemoved(Success { .. }), true) => true,
+				(OutboundHTLCState::RemoteRemoved(Success { .. }), false) => false,
+				(OutboundHTLCState::AwaitingRemoteRevokeToRemove(Success { .. }), _) => true,
+				(OutboundHTLCState::AwaitingRemovedRemoteRevoke(Success { .. }), _) => true,
 				_ => false,
 			})
 			.map(|OutboundHTLCOutput { amount_msat, .. }| amount_msat)
@@ -7766,8 +7769,8 @@ where
 	fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, outcome: OutboundHTLCOutcome) -> Result<&OutboundHTLCOutput, ChannelError> {
 		for htlc in self.context.pending_outbound_htlcs.iter_mut() {
 			if htlc.htlc_id == htlc_id {
-				if let OutboundHTLCOutcome::Success(ref payment_preimage, ..) = outcome {
-					let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0[..]).to_byte_array());
+				if let OutboundHTLCOutcome::Success { ref preimage, .. } = outcome {
+					let payment_hash = PaymentHash(Sha256::hash(&preimage.0[..]).to_byte_array());
 					if payment_hash != htlc.payment_hash {
 						return Err(ChannelError::close(format!("Remote tried to fulfill HTLC ({}) with an incorrect preimage", htlc_id)));
 					}
@@ -7808,8 +7811,10 @@ where
 			));
 		}
 
-		let outcome =
-			OutboundHTLCOutcome::Success(msg.payment_preimage, msg.attribution_data.clone());
+		let outcome = OutboundHTLCOutcome::Success {
+			preimage: msg.payment_preimage,
+			attribution_data: msg.attribution_data.clone(),
+		};
 		self.mark_outbound_htlc_removed(msg.htlc_id, outcome).map(|htlc| {
 			(htlc.source.clone(), htlc.amount_msat, htlc.skimmed_fee_msat, htlc.send_timestamp)
 		})
@@ -8197,9 +8202,12 @@ where
 				log_trace!(logger, "Updating HTLC {} to AwaitingRemoteRevokeToRemove due to commitment_signed in channel {}.",
 					&htlc.payment_hash, &self.context.channel_id);
 				// Swap against a dummy variant to avoid a potentially expensive clone of `OutboundHTLCOutcome::Failure(HTLCFailReason)`
-				let mut reason = OutboundHTLCOutcome::Success(PaymentPreimage([0u8; 32]), None);
+				let mut reason = OutboundHTLCOutcome::Success {
+					preimage: PaymentPreimage([0u8; 32]),
+					attribution_data: None,
+				};
 				mem::swap(outcome, &mut reason);
-				if let OutboundHTLCOutcome::Success(preimage, _) = reason {
+				if let OutboundHTLCOutcome::Success { preimage, .. } = reason {
 					// If a user (a) receives an HTLC claim using LDK 0.0.104 or before, then (b)
 					// upgrades to LDK 0.0.114 or later before the HTLC is fully resolved, we could
 					// have a `Success(None)` reason. In this case we could forget some HTLC
@@ -8672,7 +8680,7 @@ where
 							});
 							revoked_htlcs.push((htlc.source.clone(), htlc.payment_hash, reason));
 						},
-						OutboundHTLCOutcome::Success(_, attribution_data) => {
+						OutboundHTLCOutcome::Success { attribution_data, .. } => {
 							// Even though a fast track was taken for fulfilled HTLCs to the incoming side, we still
 							// pass along attribution data here so that we can include hold time information in the
 							// final PaymentPathSuccessful events.
@@ -8781,7 +8789,10 @@ where
 				{
 					log_trace!(logger, " ...promoting outbound AwaitingRemoteRevokeToRemove {} to AwaitingRemovedRemoteRevoke", &htlc.payment_hash);
 					// Swap against a dummy variant to avoid a potentially expensive clone of `OutboundHTLCOutcome::Failure(HTLCFailReason)`
-					let mut reason = OutboundHTLCOutcome::Success(PaymentPreimage([0u8; 32]), None);
+					let mut reason = OutboundHTLCOutcome::Success {
+						preimage: PaymentPreimage([0u8; 32]),
+						attribution_data: None,
+					};
 					mem::swap(outcome, &mut reason);
 					htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke(reason);
 					require_commitment = true;
@@ -12720,7 +12731,7 @@ where
 			if let &mut OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref mut outcome) = &mut htlc.state {
 				log_trace!(logger, " ...promoting outbound AwaitingRemoteRevokeToRemove {} to AwaitingRemovedRemoteRevoke", &htlc.payment_hash);
 				// Swap against a dummy variant to avoid a potentially expensive clone of `OutboundHTLCOutcome::Failure(HTLCFailReason)`
-				let mut reason = OutboundHTLCOutcome::Success(PaymentPreimage([0u8; 32]), None);
+				let mut reason = OutboundHTLCOutcome::Success { preimage:PaymentPreimage([0u8; 32]), attribution_data:None };
 				mem::swap(outcome, &mut reason);
 				htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke(reason);
 			}
@@ -14552,7 +14563,7 @@ where
 				},
 				&OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref outcome) => {
 					3u8.write(writer)?;
-					if let OutboundHTLCOutcome::Success(preimage, attribution_data) = outcome {
+					if let OutboundHTLCOutcome::Success { preimage, attribution_data } = outcome {
 						preimages.push(Some(preimage));
 						fulfill_attribution_data.push(attribution_data);
 					}
@@ -14561,7 +14572,7 @@ where
 				},
 				&OutboundHTLCState::AwaitingRemovedRemoteRevoke(ref outcome) => {
 					4u8.write(writer)?;
-					if let OutboundHTLCOutcome::Success(preimage, attribution_data) = outcome {
+					if let OutboundHTLCOutcome::Success { preimage, attribution_data } = outcome {
 						preimages.push(Some(preimage));
 						fulfill_attribution_data.push(attribution_data);
 					}
@@ -14998,7 +15009,10 @@ where
 						let outcome = match option {
 							Some(r) => OutboundHTLCOutcome::Failure(r),
 							// Initialize this variant with a dummy preimage, the actual preimage will be filled in further down
-							None => OutboundHTLCOutcome::Success(PaymentPreimage([0u8; 32]), None),
+							None => OutboundHTLCOutcome::Success {
+								preimage: PaymentPreimage([0u8; 32]),
+								attribution_data: None,
+							},
 						};
 						OutboundHTLCState::RemoteRemoved(outcome)
 					},
@@ -15007,7 +15021,10 @@ where
 						let outcome = match option {
 							Some(r) => OutboundHTLCOutcome::Failure(r),
 							// Initialize this variant with a dummy preimage, the actual preimage will be filled in further down
-							None => OutboundHTLCOutcome::Success(PaymentPreimage([0u8; 32]), None),
+							None => OutboundHTLCOutcome::Success {
+								preimage: PaymentPreimage([0u8; 32]),
+								attribution_data: None,
+							},
 						};
 						OutboundHTLCState::AwaitingRemoteRevokeToRemove(outcome)
 					},
@@ -15016,7 +15033,10 @@ where
 						let outcome = match option {
 							Some(r) => OutboundHTLCOutcome::Failure(r),
 							// Initialize this variant with a dummy preimage, the actual preimage will be filled in further down
-							None => OutboundHTLCOutcome::Success(PaymentPreimage([0u8; 32]), None),
+							None => OutboundHTLCOutcome::Success {
+								preimage: PaymentPreimage([0u8; 32]),
+								attribution_data: None,
+							},
 						};
 						OutboundHTLCState::AwaitingRemovedRemoteRevoke(outcome)
 					},
@@ -15303,14 +15323,14 @@ where
 		let mut fulfill_attribution_data_iter = fulfill_attribution_data.map(Vec::into_iter);
 		for htlc in pending_outbound_htlcs.iter_mut() {
 			match &mut htlc.state {
-				OutboundHTLCState::AwaitingRemoteRevokeToRemove(OutboundHTLCOutcome::Success(
+				OutboundHTLCState::AwaitingRemoteRevokeToRemove(OutboundHTLCOutcome::Success {
 					ref mut preimage,
 					ref mut attribution_data,
-				))
-				| OutboundHTLCState::AwaitingRemovedRemoteRevoke(OutboundHTLCOutcome::Success(
+				})
+				| OutboundHTLCState::AwaitingRemovedRemoteRevoke(OutboundHTLCOutcome::Success {
 					ref mut preimage,
 					ref mut attribution_data,
-				)) => {
+				}) => {
 					// This variant was initialized like this further above
 					debug_assert_eq!(preimage, &PaymentPreimage([0u8; 32]));
 					// Flatten and unwrap the preimage; they are always set starting in 0.2.