chore: Upgrade Rust to 1.86 (#518)

Also upgrade the cargo resolver to v3, the default.

New clippy lints:
- `next_back()` instead of `last()` for a double-ended iterator. That avoids walking the whole list.
- ` repeat_n` instead of `repeat.take`. That avoids cloning.
- Doc indenting

.github/workflows/pre-merge-rust.yml

@@ -66,7 +66,7 @@ jobs:
       if: ${{ env.ACT }}
       run: |
         curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
-        rustup toolchain install 1.85.0-x86_64-unknown-linux-gnu
+        rustup toolchain install 1.86.0-x86_64-unknown-linux-gnu
         echo "$HOME/.cargo/bin" >> $GITHUB_PATH
     - name: Set up Rust Toolchain Components
       run: rustup component add rustfmt clippy

Cargo.toml

@@ -22,7 +22,7 @@ members = [
     "lib/bindings/c",
     "lib/engines/*",
 ]
-resolver = "2"
+resolver = "3"
 
 [workspace.package]
 version = "0.1.0"

Earthfile

@@ -73,13 +73,13 @@ rust-base:
     ENV RUSTUP_HOME=/usr/local/rustup
     ENV CARGO_HOME=/usr/local/cargo
     ENV PATH=/usr/local/cargo/bin:$PATH
-    ENV RUST_VERSION=1.85.0
+    ENV RUST_VERSION=1.86.0
     ENV RUSTARCH=x86_64-unknown-linux-gnu
 
     RUN wget --tries=3 --waitretry=5 "https://static.rust-lang.org/rustup/archive/1.28.1/x86_64-unknown-linux-gnu/rustup-init" && \
         echo "a3339fb004c3d0bb9862ba0bce001861fe5cbde9c10d16591eb3f39ee6cd3e7f *rustup-init" | sha256sum -c - && \
         chmod +x rustup-init && \
-        ./rustup-init -y --no-modify-path --profile minimal --default-toolchain 1.85.0 --default-host x86_64-unknown-linux-gnu && \
+        ./rustup-init -y --no-modify-path --profile minimal --default-toolchain 1.86.0 --default-host x86_64-unknown-linux-gnu && \
         rm rustup-init && \
         chmod -R a+w $RUSTUP_HOME $CARGO_HOME
 

container/Dockerfile.none

@@ -25,7 +25,7 @@ RUN apt update -y && \
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH \
-    RUST_VERSION=1.85.0 \
+    RUST_VERSION=1.86.0 \
     RUSTARCH=x86_64-unknown-linux-gnu
 
 RUN wget --tries=3 --waitretry=5 "https://static.rust-lang.org/rustup/archive/1.28.1/${RUSTARCH}/rustup-init" && \

container/Dockerfile.tensorrt_llm

@@ -68,7 +68,7 @@ RUN apt-get update && \
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH \
-    RUST_VERSION=1.85.0 \
+    RUST_VERSION=1.86.0 \
     RUSTARCH=x86_64-unknown-linux-gnu
 
 RUN wget --tries=3 --waitretry=5 "https://static.rust-lang.org/rustup/archive/1.28.1/${RUSTARCH}/rustup-init" && \

container/Dockerfile.vllm

@@ -237,7 +237,7 @@ RUN apt update -y && \
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH \
-    RUST_VERSION=1.85.0 \
+    RUST_VERSION=1.86.0 \
     RUSTARCH=x86_64-unknown-linux-gnu
 
 RUN wget --tries=3 --waitretry=5 "https://static.rust-lang.org/rustup/archive/1.28.1/${RUSTARCH}/rustup-init" && \

launch/dynamo-run/src/lib.rs

@@ -100,7 +100,7 @@ pub async fn run(
         .or_else(|| {
             model_path
                 .as_ref()
-                .and_then(|p| p.iter().last())
+                .and_then(|p| p.iter().next_back())
                 .map(|n| n.to_string_lossy().into_owned())
         })
         .or_else(|| {
@@ -116,7 +116,7 @@ pub async fn run(
         if !inner_model_path.exists() {
             model_name = inner_model_path
                 .iter()
-                .last()
+                .next_back()
                 .map(|s| s.to_string_lossy().to_string());
             model_path = Some(hub::from_hf(inner_model_path).await?);
         }

lib/llm/src/engines.rs

@@ -139,7 +139,7 @@ impl
         let (request, context) = incoming_request.transfer(());
         let deltas = request.response_generator();
         let ctx = context.context();
-        let req = request.inner.messages.into_iter().last().unwrap();
+        let req = request.inner.messages.into_iter().next_back().unwrap();
 
         let prompt = match req {
             async_openai::types::ChatCompletionRequestMessage::User(user_msg) => {

lib/llm/src/kv_router/indexer.rs

@@ -822,9 +822,7 @@ impl KvIndexerInterface for KvIndexerSharded {
                                 - (scores.frequencies.len() as i64);
 
                             if diff > 0 {
-                                scores
-                                    .frequencies
-                                    .extend(iter::repeat(0).take(diff as usize));
+                                scores.frequencies.extend(iter::repeat_n(0, diff as usize));
                             }
 
                             for i in 0..response.frequencies.len() {

lib/llm/src/model_card/create.rs

@@ -62,7 +62,7 @@ impl ModelDeploymentCard {
         let model_name = model_name.map(|s| s.to_string()).or_else(|| {
             gguf_file
                 .iter()
-                .last()
+                .next_back()
                 .map(|n| n.to_string_lossy().to_string())
         });
         let Some(model_name) = model_name else {

lib/runtime/examples/Cargo.toml

@@ -18,7 +18,7 @@ members = [
     "hello_world",
     "service_metrics",
 ]
-resolver = "2"
+resolver = "3"
 
 [workspace.package]
 version = "0.1.0"

lib/runtime/examples/rust-toolchain.toml

 [toolchain]
-channel = "1.85.0"
+channel = "1.86.0"

lib/runtime/src/service.rs

@@ -67,7 +67,7 @@ impl EndpointInfo {
         let id = self
             .subject
             .split('-')
-            .last()
+            .next_back()
             .ok_or_else(|| error!("No id found in subject"))?;
 
         i64::from_str_radix(id, 16).map_err(|e| error!("Invalid id format: {}", e))

rust-toolchain.toml

 [toolchain]
-channel = "1.85.0"
+channel = "1.86.0"