refactor(chain,bdk): fix clippy warnings

fix "use of `or_insert_with` to construct default value"
fix "this `impl` can be derived"

clippy.toml

@@ -1 +1 @@
-msrv="1.57.0"
+msrv="1.63.0"

crates/bdk/src/wallet/signer.rs

@@ -812,9 +812,10 @@ pub struct SignOptions {
 }
 
 /// Customize which taproot script-path leaves the signer should sign.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Default)]
 pub enum TapLeavesOptions {
     /// The signer will sign all the leaves it has a key for.
+    #[default]
     All,
     /// The signer won't sign leaves other than the ones specified. Note that it could still ignore
     /// some of the specified leaves, if it doesn't have the right key to sign them.
@@ -825,12 +826,6 @@ pub enum TapLeavesOptions {
     None,
 }
 
-impl Default for TapLeavesOptions {
-    fn default() -> Self {
-        TapLeavesOptions::All
-    }
-}
-
 #[allow(clippy::derivable_impls)]
 impl Default for SignOptions {
     fn default() -> Self {

crates/bdk/src/wallet/tx_builder.rs

@@ -811,22 +811,17 @@ impl<'a, D> TxBuilder<'a, D, DefaultCoinSelectionAlgorithm, BumpFee> {
 }
 
 /// Ordering of the transaction's inputs and outputs
-#[derive(Debug, Ord, PartialOrd, Eq, PartialEq, Hash, Clone, Copy)]
+#[derive(Debug, Ord, PartialOrd, Eq, PartialEq, Hash, Clone, Copy, Default)]
 pub enum TxOrdering {
     /// Randomized (default)
+    #[default]
     Shuffle,
     /// Unchanged
     Untouched,
     /// BIP69 / Lexicographic
     Bip69Lexicographic,
 }
 
-impl Default for TxOrdering {
-    fn default() -> Self {
-        TxOrdering::Shuffle
-    }
-}
-
 impl TxOrdering {
     /// Sort transaction inputs and outputs by [`TxOrdering`] variant
     pub fn sort_tx(&self, tx: &mut Transaction) {
@@ -880,22 +875,17 @@ impl RbfValue {
 }
 
 /// Policy regarding the use of change outputs when creating a transaction
-#[derive(Debug, Ord, PartialOrd, Eq, PartialEq, Hash, Clone, Copy)]
+#[derive(Debug, Ord, PartialOrd, Eq, PartialEq, Hash, Clone, Copy, Default)]
 pub enum ChangeSpendPolicy {
     /// Use both change and non-change outputs (default)
+    #[default]
     ChangeAllowed,
     /// Only use change outputs (see [`TxBuilder::only_spend_change`])
     OnlyChange,
     /// Only use non-change outputs (see [`TxBuilder::do_not_spend_change`])
     ChangeForbidden,
 }
 
-impl Default for ChangeSpendPolicy {
-    fn default() -> Self {
-        ChangeSpendPolicy::ChangeAllowed
-    }
-}
-
 impl ChangeSpendPolicy {
     pub(crate) fn is_satisfied_by(&self, utxo: &LocalOutput) -> bool {
         match self {

crates/chain/src/tx_graph.rs

@@ -581,10 +581,7 @@ impl<A: Clone + Ord> TxGraph<A> {
         }
 
         for (outpoint, txout) in changeset.txouts {
-            let tx_entry = self
-                .txs
-                .entry(outpoint.txid)
-                .or_insert_with(Default::default);
+            let tx_entry = self.txs.entry(outpoint.txid).or_default();
 
             match tx_entry {
                 (TxNodeInternal::Whole(_), _, _) => { /* do nothing since we already have full tx */
@@ -597,13 +594,13 @@ impl<A: Clone + Ord> TxGraph<A> {
 
         for (anchor, txid) in changeset.anchors {
             if self.anchors.insert((anchor.clone(), txid)) {
-                let (_, anchors, _) = self.txs.entry(txid).or_insert_with(Default::default);
+                let (_, anchors, _) = self.txs.entry(txid).or_default();
                 anchors.insert(anchor);
             }
         }
 
         for (txid, new_last_seen) in changeset.last_seen {
-            let (_, _, last_seen) = self.txs.entry(txid).or_insert_with(Default::default);
+            let (_, _, last_seen) = self.txs.entry(txid).or_default();
             if new_last_seen > *last_seen {
                 *last_seen = new_last_seen;
             }