Update rust to 1.71.0 (#4718)

Co-authored-by: Joonas Koivunen <joonas@neon.tech>

libs/pq_proto/src/lib.rs

@@ -934,6 +934,15 @@ impl<'a> BeMessage<'a> {
     }
 }
 
+fn terminate_code(code: &[u8; 5]) -> [u8; 6] {
+    let mut terminated = [0; 6];
+    for (i, &elem) in code.iter().enumerate() {
+        terminated[i] = elem;
+    }
+
+    terminated
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -965,12 +974,3 @@ mod tests {
         assert_eq!(split_options(&params), ["foo bar", " \\", "baz ", "lol"]);
     }
 }
-
-fn terminate_code(code: &[u8; 5]) -> [u8; 6] {
-    let mut terminated = [0; 6];
-    for (i, &elem) in code.iter().enumerate() {
-        terminated[i] = elem;
-    }
-
-    terminated
-}

libs/remote_storage/src/local_fs.rs

@@ -151,10 +151,7 @@ impl RemoteStorage for LocalFs {
         let mut files = vec![];
         let mut directory_queue = vec![full_path.clone()];
 
-        while !directory_queue.is_empty() {
-            let cur_folder = directory_queue
-                .pop()
-                .expect("queue cannot be empty: we just checked");
+        while let Some(cur_folder) = directory_queue.pop() {
             let mut entries = fs::read_dir(cur_folder.clone()).await?;
             while let Some(entry) = entries.next_entry().await? {
                 let file_name: PathBuf = entry.file_name().into();

pageserver/src/tenant/layer_map/historic_layer_coverage.rs

@@ -122,8 +122,7 @@ impl<Value: Clone> HistoricLayerCoverage<Value> {
         self.head = self
             .historic
             .iter()
-            .rev()
-            .next()
+            .next_back()
             .map(|(_, v)| v.clone())
             .unwrap_or_default();
     }

pageserver/src/tenant/layer_map/layer_coverage.rs

@@ -113,8 +113,7 @@ impl<Value: Clone> LayerCoverage<Value> {
     pub fn query(&self, key: i128) -> Option<Value> {
         self.nodes
             .range(..=key)
-            .rev()
-            .next()?
+            .next_back()?
             .1
             .as_ref()
             .map(|(_, v)| v.clone())

rust-toolchain.toml

@@ -1,5 +1,5 @@
 [toolchain]
-channel = "1.70.0"
+channel = "1.71.0"
 profile = "default"
 # The default profile includes rustc, rust-std, cargo, rust-docs, rustfmt and clippy.
 # https://rust-lang.github.io/rustup/concepts/profiles.html