From 735db0285094131bed4c13f533f6a89fb9a07e77 Mon Sep 17 00:00:00 2001
From: LLFourn <lloyd.fourn@gmail.com>
Date: Tue, 5 Jan 2021 12:08:43 +1100
Subject: [PATCH] Assert that `.finish()` hasn't been called already in
 coin_selection

---
 src/wallet/tx_builder.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/wallet/tx_builder.rs b/src/wallet/tx_builder.rs
index 089aad43..a9ed5d8b 100644
--- a/src/wallet/tx_builder.rs
+++ b/src/wallet/tx_builder.rs
@@ -414,6 +414,10 @@ impl<'a, B, D: BatchDatabase, Cs: CoinSelectionAlgorithm<D>, Ctx: TxBuilderConte
         self,
         coin_selection: P,
     ) -> TxBuilder<'a, B, D, P, Ctx> {
+        assert!(
+            self.coin_selection.is_some(),
+            "can't set coin_selection after finish() has been called"
+        );
         TxBuilder {
             wallet: self.wallet,
             params: self.params,