Update Rust, Clippy, Rustfmt.

Clippy 0.0.202 fixes a bug that prevented using it here.
rust-lang/rust-clippy#2594

.travis.yml

@@ -5,7 +5,7 @@ dist: trusty
 language: rust
 services: docker
 sudo: required
-rust: nightly-2018-04-19
+rust: nightly-2018-05-19
 cache: cargo
 
 env:
@@ -24,7 +24,7 @@ before_install:
   - set -e
   - rustup self update
   - rustup component add rustfmt-preview
-  # - cargo install clippy -f --vers=0.0.195
+  - cargo install clippy -f --vers=0.0.202
 
 install:
   - sh ci/install.sh
@@ -44,7 +44,7 @@ deploy:
   file_glob: true
   file: $CRATE_NAME-$TRAVIS_TAG-$TARGET.*
   on:
-    condition: $TRAVIS_RUST_VERSION = nightly-2018-04-19
+    condition: $TRAVIS_RUST_VERSION = nightly-2018-05-19
     tags: true
   provider: releases
   skip_cleanup: true

ci/script.sh

@@ -14,6 +14,8 @@ main() {
     cross test --target $TARGET --release
 
     cross build --target $TARGET --release
+
+    cross clippy --tests --all-features -- -D clippy
 }
 
 # we don't run the "test phase" when doing deploys

src/main.rs

@@ -31,22 +31,28 @@ use web3::futures::Future;
 /// The maximum age in seconds of the latest block.
 const MAX_BLOCK_AGE: u64 = 60 * 60;
 
-use_contract!(
-    net_con,
-    "NetworkConsensus",
-    "abi/PoaNetworkConsensus.abi.json"
-);
-use_contract!(
-    voting,
-    "VotingToChangeKeys",
-    "abi/VotingToChangeKeys.abi.json"
-);
-use_contract!(
-    val_meta,
-    "ValidatorMetadata",
-    "abi/ValidatorMetadata.abi.json"
-);
-use_contract!(key_mgr, "KeysManager", "abi/KeysManager.abi.json");
+// The `use_contract!` macro triggers several Clippy warnings.
+#[cfg_attr(feature = "cargo-clippy", allow(too_many_arguments, redundant_closure, needless_update))]
+mod contracts {
+    use_contract!(
+        net_con,
+        "NetworkConsensus",
+        "abi/PoaNetworkConsensus.abi.json"
+    );
+    use_contract!(
+        voting,
+        "VotingToChangeKeys",
+        "abi/VotingToChangeKeys.abi.json"
+    );
+    use_contract!(
+        val_meta,
+        "ValidatorMetadata",
+        "abi/ValidatorMetadata.abi.json"
+    );
+    use_contract!(key_mgr, "KeysManager", "abi/KeysManager.abi.json");
+}
+
+use contracts::*;
 
 #[derive(Deserialize)]
 #[serde(rename_all = "SCREAMING_SNAKE_CASE")]

src/stats.rs

@@ -29,7 +29,8 @@ impl Stats {
     /// `votes` are the ones that were actually cast.
     pub fn add_ballot(&mut self, voters: &[Address], votes: &[voting::logs::Vote]) {
         for voter in voters {
-            let mut vs = self.voter_stats
+            let mut vs = self
+                .voter_stats
                 .entry(voter.clone())
                 .or_insert_with(VoterStats::default);
             vs.ballots += 1;
@@ -59,7 +60,8 @@ impl Stats {
 
 impl Display for Stats {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        let mut lines: Vec<DisplayLine> = self.voter_stats
+        let mut lines: Vec<DisplayLine> = self
+            .voter_stats
             .iter()
             .map(|(addr, s)| DisplayLine {
                 votes_per_thousand: s.voted * 1000 / s.ballots,