Preemptively box cancel tx to avoid size difference in enum

swap/src/database/alice.rs

@@ -150,7 +150,7 @@ impl From<Alice> for AliceState {
 
                 AliceState::BtcCancelled {
                     state3: Box::new(state),
-                    tx_cancel,
+                    tx_cancel: Box::new(tx_cancel),
                 }
             }
             Alice::BtcPunishable(state3) => {

swap/src/protocol/alice/state.rs

@@ -46,7 +46,7 @@ pub enum AliceState {
     },
     BtcRedeemed,
     BtcCancelled {
-        tx_cancel: TxCancel,
+        tx_cancel: Box<TxCancel>,
         state3: Box<State3>,
     },
     BtcRefunded {

swap/src/protocol/alice/swap.rs

@@ -305,7 +305,10 @@ async fn run_until_internal(
                 )
                 .await?;
 
-                let state = AliceState::BtcCancelled { state3, tx_cancel };
+                let state = AliceState::BtcCancelled {
+                    state3,
+                    tx_cancel: Box::new(tx_cancel),
+                };
                 let db_state = (&state).into();
                 db.insert_latest_state(swap_id, database::Swap::Alice(db_state))
                     .await?;