diff --git a/src/accountant.rs b/src/accountant.rs
index 1e77c26be..8bdfd51fa 100644
--- a/src/accountant.rs
+++ b/src/accountant.rs
@@ -127,7 +127,7 @@ impl Accountant {
         }
 
         let mut plan = tr.plan.clone();
-        plan.apply_witness(Witness::Timestamp(self.last_time));
+        plan.apply_witness(&Witness::Timestamp(self.last_time));
 
         if plan.is_complete() {
             complete_transaction(&mut self.balances, &plan);
@@ -140,7 +140,7 @@ impl Accountant {
 
     fn process_verified_sig(&mut self, from: PublicKey, tx_sig: Signature) -> Result<()> {
         if let Occupied(mut e) = self.pending.entry(tx_sig) {
-            e.get_mut().apply_witness(Witness::Signature(from));
+            e.get_mut().apply_witness(&Witness::Signature(from));
             if e.get().is_complete() {
                 complete_transaction(&mut self.balances, e.get());
                 e.remove_entry();
@@ -168,7 +168,7 @@ impl Accountant {
         // Check to see if any timelocked transactions can be completed.
         let mut completed = vec![];
         for (key, plan) in &mut self.pending {
-            plan.apply_witness(Witness::Timestamp(self.last_time));
+            plan.apply_witness(&Witness::Timestamp(self.last_time));
             if plan.is_complete() {
                 complete_transaction(&mut self.balances, plan);
                 completed.push(key.clone());
diff --git a/src/accountant_skel.rs b/src/accountant_skel.rs
index f748c0a9e..af55b73b3 100644
--- a/src/accountant_skel.rs
+++ b/src/accountant_skel.rs
@@ -92,13 +92,13 @@ impl AccountantSkel {
         &mut self,
         r_reader: &streamer::Receiver,
         s_sender: &streamer::Sender,
-        recycler: streamer::Recycler,
+        recycler: &streamer::Recycler,
     ) -> Result<()> {
         let timer = Duration::new(1, 0);
         let msgs = r_reader.recv_timeout(timer)?;
         let msgs_ = msgs.clone();
         let msgs__ = msgs.clone();
-        let rsps = streamer::allocate(&recycler);
+        let rsps = streamer::allocate(recycler);
         let rsps_ = rsps.clone();
         let l = msgs__.read().unwrap().packets.len();
         rsps.write()
@@ -124,7 +124,7 @@ impl AccountantSkel {
             ursps.packets.resize(num, streamer::Packet::default());
         }
         s_sender.send(rsps_)?;
-        streamer::recycle(&recycler, msgs_);
+        streamer::recycle(recycler, msgs_);
         Ok(())
     }
 
@@ -150,9 +150,7 @@ impl AccountantSkel {
         let t_server = spawn(move || {
             if let Ok(me) = Arc::try_unwrap(obj) {
                 loop {
-                    let e = me.lock()
-                        .unwrap()
-                        .process(&r_reader, &s_sender, recycler.clone());
+                    let e = me.lock().unwrap().process(&r_reader, &s_sender, &recycler);
                     if e.is_err() && exit.load(Ordering::Relaxed) {
                         break;
                     }
diff --git a/src/ledger.rs b/src/ledger.rs
index bb216ff30..d858d9179 100644
--- a/src/ledger.rs
+++ b/src/ledger.rs
@@ -1,14 +1,14 @@
 //! The `ledger` crate provides the foundational data structures for Proof-of-History,
 //! an ordered log of events in time.
 
-/// Each entry contains three pieces of data. The 'num_hashes' field is the number
-/// of hashes performed since the previous entry.  The 'id' field is the result
-/// of hashing 'id' from the previous entry 'num_hashes' times.  The 'event'
-/// field points to an Event that took place shortly after 'id' was generated.
+/// Each entry contains three pieces of data. The `num_hashes` field is the number
+/// of hashes performed since the previous entry.  The `id` field is the result
+/// of hashing `id` from the previous entry `num_hashes` times.  The `event`
+/// field points to an Event that took place shortly after `id` was generated.
 ///
-/// If you divide 'num_hashes' by the amount of time it takes to generate a new hash, you
+/// If you divide `num_hashes` by the amount of time it takes to generate a new hash, you
 /// get a duration estimate since the last event. Since processing power increases
-/// over time, one should expect the duration 'num_hashes' represents to decrease proportionally.
+/// over time, one should expect the duration `num_hashes` represents to decrease proportionally.
 /// Though processing power varies across nodes, the network gives priority to the
 /// fastest processor. Duration should therefore be estimated by assuming that the hash
 /// was generated by the fastest processor at the time the entry was recorded.
@@ -24,7 +24,7 @@ pub fn verify_slice(entries: &[Entry], start_hash: &Hash) -> bool {
     event_pairs.all(|(x0, x1)| x1.verify(&x0.id))
 }
 
-/// Create a vector of Ticks of length 'len' from 'start_hash' hash and 'num_hashes'.
+/// Create a vector of Ticks of length `len` from `start_hash` hash and `num_hashes`.
 pub fn next_ticks(start_hash: &Hash, num_hashes: u64, len: usize) -> Vec<Entry> {
     let mut id = *start_hash;
     let mut ticks = vec![];
diff --git a/src/plan.rs b/src/plan.rs
index e455218ea..f28ccec45 100644
--- a/src/plan.rs
+++ b/src/plan.rs
@@ -75,8 +75,9 @@ impl Plan {
 
     pub fn verify(&self, spendable_tokens: i64) -> bool {
         match *self {
-            Plan::Pay(ref payment) => payment.tokens == spendable_tokens,
-            Plan::After(_, ref payment) => payment.tokens == spendable_tokens,
+            Plan::Pay(ref payment) | Plan::After(_, ref payment) => {
+                payment.tokens == spendable_tokens
+            }
             Plan::Race(ref a, ref b) => {
                 a.1.tokens == spendable_tokens && b.1.tokens == spendable_tokens
             }
@@ -85,13 +86,13 @@ impl Plan {
 
     /// Apply a witness to the spending plan to see if the plan can be reduced.
     /// If so, modify the plan in-place.
-    pub fn apply_witness(&mut self, witness: Witness) {
+    pub fn apply_witness(&mut self, witness: &Witness) {
         let new_payment = match *self {
-            Plan::After(ref cond, ref payment) if cond.is_satisfied(&witness) => Some(payment),
-            Plan::Race((ref cond, ref payment), _) if cond.is_satisfied(&witness) => Some(payment),
-            Plan::Race(_, (ref cond, ref payment)) if cond.is_satisfied(&witness) => Some(payment),
+            Plan::After(ref cond, ref payment) if cond.is_satisfied(witness) => Some(payment),
+            Plan::Race((ref cond, ref payment), _) if cond.is_satisfied(witness) => Some(payment),
+            Plan::Race(_, (ref cond, ref payment)) if cond.is_satisfied(witness) => Some(payment),
             _ => None,
-        }.map(|x| x.clone());
+        }.cloned();
 
         if let Some(payment) = new_payment {
             mem::replace(self, Plan::Pay(payment));
@@ -135,7 +136,7 @@ mod tests {
         let to = PublicKey::default();
 
         let mut plan = Plan::new_authorized_payment(from, 42, to);
-        plan.apply_witness(Witness::Signature(from));
+        plan.apply_witness(&Witness::Signature(from));
         assert_eq!(plan, Plan::new_payment(42, to));
     }
 
@@ -145,7 +146,7 @@ mod tests {
         let to = PublicKey::default();
 
         let mut plan = Plan::new_future_payment(dt, 42, to);
-        plan.apply_witness(Witness::Timestamp(dt));
+        plan.apply_witness(&Witness::Timestamp(dt));
         assert_eq!(plan, Plan::new_payment(42, to));
     }
 
@@ -156,11 +157,11 @@ mod tests {
         let to = PublicKey::default();
 
         let mut plan = Plan::new_cancelable_future_payment(dt, from, 42, to);
-        plan.apply_witness(Witness::Timestamp(dt));
+        plan.apply_witness(&Witness::Timestamp(dt));
         assert_eq!(plan, Plan::new_payment(42, to));
 
         let mut plan = Plan::new_cancelable_future_payment(dt, from, 42, to);
-        plan.apply_witness(Witness::Signature(from));
+        plan.apply_witness(&Witness::Signature(from));
         assert_eq!(plan, Plan::new_payment(42, from));
     }
 }