Bump rust version in CI and fix clippy warnings

Author: kelvich

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
       - run: docker compose up -d
       - uses: sfackler/actions/rustup@master
         with:
-          version: 1.62.0
+          version: 1.65.0
       - run: echo "::set-output name=version::$(rustc --version)"
         id: rust-version
       - uses: actions/cache@v1

postgres-derive-test/src/lib.rs

@@ -14,7 +14,7 @@ where
     T: PartialEq + FromSqlOwned + ToSql + Sync,
     S: fmt::Display,
 {
-    for &(ref val, ref repr) in checks.iter() {
+    for (val, repr) in checks.iter() {
         let stmt = conn
             .prepare(&format!("SELECT {}::{}", *repr, sql_type))
             .unwrap();
@@ -38,7 +38,7 @@ pub fn test_type_asymmetric<T, F, S, C>(
     S: fmt::Display,
     C: Fn(&T, &F) -> bool,
 {
-    for &(ref val, ref repr) in checks.iter() {
+    for (val, repr) in checks.iter() {
         let stmt = conn
             .prepare(&format!("SELECT {}::{}", *repr, sql_type))
             .unwrap();

postgres-protocol/src/authentication/sasl.rs

@@ -389,7 +389,7 @@ impl<'a> Parser<'a> {
     }
 
     fn posit_number(&mut self) -> io::Result<u32> {
-        let n = self.take_while(|c| matches!(c, '0'..='9'))?;
+        let n = self.take_while(|c| c.is_ascii_digit())?;
         n.parse()
             .map_err(|e| io::Error::new(io::ErrorKind::InvalidInput, e))
     }

postgres-protocol/src/message/backend.rs

@@ -707,7 +707,7 @@ impl<'a> FallibleIterator for DataRowRanges<'a> {
                 ));
             }
             let base = self.len - self.buf.len();
-            self.buf = &self.buf[len as usize..];
+            self.buf = &self.buf[len..];
             Ok(Some(Some(base..base + len)))
         }
     }