fix(clippy): Fix new lints in nightly clippy (#5959)

* Derive default using #[default]

* Implement PartialEq manually to satisfy clippy

* Allow a manual derive in test-only code

* Fix some missing docs warnings in the Docker build

zebra-chain/src/orchard/tree.rs

@@ -10,8 +10,6 @@
 //!
 //! A root of a note commitment tree is associated with each treestate.
 
-#![allow(clippy::derive_hash_xor_eq)]
-
 use std::{
     fmt,
     hash::{Hash, Hasher},
@@ -99,7 +97,7 @@ lazy_static! {
 /// The root hash in LEBS2OSP256(rt) encoding of the Orchard note commitment
 /// tree corresponding to the final Orchard treestate of this block. A root of a
 /// note commitment tree is associated with each treestate.
-#[derive(Clone, Copy, Default, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Clone, Copy, Default, Eq, Serialize, Deserialize)]
 pub struct Root(#[serde(with = "serde_helpers::Base")] pub(crate) pallas::Base);
 
 impl fmt::Debug for Root {
@@ -128,6 +126,13 @@ impl Hash for Root {
     }
 }
 
+impl PartialEq for Root {
+    fn eq(&self, other: &Self) -> bool {
+        // TODO: should we compare canonical forms here using `.to_repr()`?
+        self.0 == other.0
+    }
+}
+
 impl TryFrom<[u8; 32]> for Root {
     type Error = SerializationError;
 

zebra-chain/src/parameters/network.rs

@@ -1,4 +1,6 @@
-use std::{convert::From, fmt, str::FromStr};
+//! Consensus parameters for each Zcash network.
+
+use std::{fmt, str::FromStr};
 
 use thiserror::Error;
 
@@ -47,11 +49,13 @@ mod tests;
 const ZIP_212_GRACE_PERIOD_DURATION: i32 = 32_256;
 
 /// An enum describing the possible network choices.
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize, Deserialize)]
+#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Hash, Serialize, Deserialize)]
 #[cfg_attr(any(test, feature = "proptest-impl"), derive(Arbitrary))]
 pub enum Network {
     /// The production mainnet.
+    #[default]
     Mainnet,
+
     /// The testnet.
     Testnet,
 }
@@ -114,12 +118,6 @@ impl Network {
     }
 }
 
-impl Default for Network {
-    fn default() -> Self {
-        Network::Mainnet
-    }
-}
-
 impl FromStr for Network {
     type Err = InvalidNetworkError;
 

zebra-network/src/meta_addr.rs

@@ -2,12 +2,12 @@
 
 use std::{
     cmp::{Ord, Ordering},
-    convert::TryInto,
     net::SocketAddr,
     time::Instant,
 };
 
 use chrono::Utc;
+
 use zebra_chain::{parameters::Network, serialization::DateTime32};
 
 use crate::{
@@ -80,6 +80,7 @@ impl PeerAddrState {
 
 // non-test code should explicitly specify the peer address state
 #[cfg(test)]
+#[allow(clippy::derivable_impls)]
 impl Default for PeerAddrState {
     fn default() -> Self {
         NeverAttemptedGossiped

zebra-test/tests/command.rs

@@ -1,3 +1,5 @@
+//! Tests for the [`zebra_test::command`] module.
+
 use std::{process::Command, time::Duration};
 
 use color_eyre::eyre::{eyre, Result};

zebra-test/tests/transcript.rs

@@ -1,6 +1,8 @@
+//! Tests for the [`zebra_test::transcript`] module.
+
 use tower::{Service, ServiceExt};
-use zebra_test::transcript::ExpectedTranscriptError;
-use zebra_test::transcript::Transcript;
+
+use zebra_test::transcript::{ExpectedTranscriptError, Transcript};
 
 const TRANSCRIPT_DATA: [(&str, Result<&str, ExpectedTranscriptError>); 4] = [
     ("req1", Ok("rsp1")),

zebra-utils/src/bin/zebra-checkpoints/main.rs

@@ -60,6 +60,7 @@ fn cmd_output(cmd: &mut std::process::Command) -> Result<String> {
     Ok(s)
 }
 
+/// Process entry point for `zebra-checkpoints`
 #[allow(clippy::print_stdout)]
 fn main() -> Result<()> {
     // initialise

zebrad/build.rs

@@ -28,6 +28,7 @@ fn disable_non_reproducible(_config: &mut Config) {
      */
 }
 
+/// Process entry point for `zebrad`'s build script
 #[allow(clippy::print_stderr)]
 fn main() {
     let mut config = Config::default();

zebrad/src/bin/zebrad/main.rs

@@ -2,7 +2,7 @@
 
 use zebrad::application::APPLICATION;
 
-/// Boot Zebrad
+/// Process entry point for `zebrad`
 fn main() {
     abscissa_core::boot(&APPLICATION);
 }

zebrad/src/components/mempool.rs

@@ -86,27 +86,27 @@ type InboundTxDownloads = TxDownloads<Timeout<Outbound>, Timeout<TxVerifier>, St
 //
 // Zebra only has one mempool, so the enum variant size difference doesn't matter.
 #[allow(clippy::large_enum_variant)]
+#[derive(Default)]
 enum ActiveState {
     /// The Mempool is disabled.
+    #[default]
     Disabled,
+
     /// The Mempool is enabled.
     Enabled {
         /// The Mempool storage itself.
         ///
-        /// ##: Correctness: only components internal to the [`Mempool`] struct are allowed to
+        /// # Correctness
+        ///
+        /// Only components internal to the [`Mempool`] struct are allowed to
         /// inject transactions into `storage`, as transactions must be verified beforehand.
         storage: storage::Storage,
+
         /// The transaction download and verify stream.
         tx_downloads: Pin<Box<InboundTxDownloads>>,
     },
 }
 
-impl Default for ActiveState {
-    fn default() -> Self {
-        ActiveState::Disabled
-    }
-}
-
 impl ActiveState {
     /// Returns the current state, leaving [`Self::Disabled`] in its place.
     fn take(&mut self) -> Self {