diff --git a/zcash_primitives/src/block.rs b/zcash_primitives/src/block.rs
index c0eb92f..f2802b4 100644
--- a/zcash_primitives/src/block.rs
+++ b/zcash_primitives/src/block.rs
@@ -10,7 +10,7 @@ use crate::serialize::Vector;
 pub struct BlockHash(pub [u8; 32]);
 
 impl fmt::Display for BlockHash {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut data = self.0.clone();
         data.reverse();
         formatter.write_str(&hex::encode(data))
diff --git a/zcash_primitives/src/jubjub/fs.rs b/zcash_primitives/src/jubjub/fs.rs
index fc14a86..b3c61dc 100644
--- a/zcash_primitives/src/jubjub/fs.rs
+++ b/zcash_primitives/src/jubjub/fs.rs
@@ -74,7 +74,7 @@ const NEGATIVE_ONE: Fs = Fs(FsRepr([
 pub struct FsRepr(pub [u64; 4]);
 
 impl ::std::fmt::Display for FsRepr {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
         r#write!(f, "0x")?;
         for i in self.0.iter().rev() {
             r#write!(f, "{:016x}", *i)?;
@@ -257,7 +257,7 @@ impl PrimeFieldRepr for FsRepr {
 pub struct Fs(FsRepr);
 
 impl ::std::fmt::Display for Fs {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
         write!(f, "Fs({})", self.into_repr())
     }
 }
diff --git a/zcash_primitives/src/lib.rs b/zcash_primitives/src/lib.rs
index 8bc5fe8..5dd5f58 100644
--- a/zcash_primitives/src/lib.rs
+++ b/zcash_primitives/src/lib.rs
@@ -1,26 +1,25 @@
 #[macro_use]
 extern crate lazy_static;
 
-extern crate aes;
-extern crate blake2b_simd;
-extern crate blake2s_simd;
-extern crate byteorder;
-extern crate crypto_api_chachapoly;
-extern crate ff;
-extern crate fpe;
-extern crate hex;
-extern crate pairing;
-extern crate rand;
-extern crate rand_core;
-extern crate rand_os;
-extern crate sha2;
+
+
+
+
+
+
+
+
+
+
+
+
+
 
 #[cfg(test)]
 #[macro_use]
 extern crate hex_literal;
 
-#[cfg(test)]
-extern crate rand_xorshift;
+
 
 pub mod block;
 pub mod constants;
diff --git a/zcash_primitives/src/transaction/components.rs b/zcash_primitives/src/transaction/components.rs
index 31a7f4e..001ff42 100644
--- a/zcash_primitives/src/transaction/components.rs
+++ b/zcash_primitives/src/transaction/components.rs
@@ -104,7 +104,7 @@ pub struct SpendDescription {
 }
 
 impl std::fmt::Debug for SpendDescription {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
             "SpendDescription(cv = {:?}, anchor = {:?}, nullifier = {:?}, rk = {:?}, spend_auth_sig = {:?})",
@@ -186,7 +186,7 @@ pub struct OutputDescription {
 }
 
 impl std::fmt::Debug for OutputDescription {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
             "OutputDescription(cv = {:?}, cmu = {:?}, ephemeral_key = {:?})",
@@ -253,7 +253,7 @@ enum SproutProof {
 }
 
 impl std::fmt::Debug for SproutProof {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         match self {
             SproutProof::Groth(_) => write!(f, "SproutProof::Groth"),
             SproutProof::PHGR(_) => write!(f, "SproutProof::PHGR"),
@@ -275,7 +275,7 @@ pub struct JSDescription {
 }
 
 impl std::fmt::Debug for JSDescription {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
             "JSDescription(
diff --git a/zcash_primitives/src/transaction/mod.rs b/zcash_primitives/src/transaction/mod.rs
index 319ba85..567d689 100644
--- a/zcash_primitives/src/transaction/mod.rs
+++ b/zcash_primitives/src/transaction/mod.rs
@@ -28,7 +28,7 @@ const SAPLING_TX_VERSION: u32 = 4;
 pub struct TxId(pub [u8; 32]);
 
 impl fmt::Display for TxId {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut data = self.0.clone();
         data.reverse();
         formatter.write_str(&hex::encode(data))
@@ -74,7 +74,7 @@ pub struct TransactionData {
 }
 
 impl std::fmt::Debug for TransactionData {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
             "TransactionData(
diff --git a/zcash_primitives/src/zip32.rs b/zcash_primitives/src/zip32.rs
index 7412406..8788809 100644
--- a/zcash_primitives/src/zip32.rs
+++ b/zcash_primitives/src/zip32.rs
@@ -198,7 +198,7 @@ impl std::cmp::PartialEq for ExtendedSpendingKey {
 }
 
 impl std::fmt::Debug for ExtendedSpendingKey {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
             "ExtendedSpendingKey(d = {}, tag_p = {:?}, i = {:?})",
@@ -221,7 +221,7 @@ impl std::cmp::PartialEq for ExtendedFullViewingKey {
 }
 
 impl std::fmt::Debug for ExtendedFullViewingKey {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
             "ExtendedFullViewingKey(d = {}, tag_p = {:?}, i = {:?})",