f Mention confirming an unbroadcasted tx indicates a bug

Author: tnull

lightning/src/util/sweep.rs

@@ -148,7 +148,7 @@ impl OutputSpendStatus {
 				// broadcasted yet. Any transactions of the counterparty may confirm on-chain, but
 				// we hold the state lock after creating the initial entry until we tried
 				// broadcasting, so this should never be reachable via `transactions_confirmed`.
-				debug_assert!(false, "We should never confirm when we haven't broadcasted.");
+				debug_assert!(false, "We should never confirm when we haven't broadcasted. This a bug and should never happen, please report.");
 				*self = Self::PendingThresholdConfirmations {
 					first_broadcast_hash: confirmation_hash,
 					latest_broadcast_height: confirmation_height,