Pin Rust toolchain versions in ci.yml

Pin dtolnay/rust-toolchain actions to specific stable and nightly versions
to prevent sudden build failures due to toolchain updates.

Also fixed the new warnings found by updating the toolchain.

Author: boivie

.github/workflows/ci.yml

@@ -15,6 +15,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.92.0
       - name: Build
         run: cargo build --verbose
       - name: Test
@@ -27,6 +29,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install Rust
         uses: dtolnay/rust-toolchain@nightly
+        with:
+          toolchain: nightly-2025-12-16
       - name: Sanity check fuzzers
         run: |
           cargo install cargo-fuzz
@@ -40,9 +44,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@nightly
         with:
-          toolchain: nightly
+          toolchain: nightly-2025-12-16
           components: rustfmt
       - run: cargo +nightly fmt --all -- --check
 
@@ -53,6 +57,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
+          toolchain: 1.92.0
           components: clippy
       - run: cargo clippy --all-features --all-targets -- -D warnings
 
@@ -62,6 +67,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.92.0
       # NOTE: We need to run `cargo test --doc` separately from normal tests:
       # https://github.com/rust-lang/cargo/issues/6669
       - name: Run doctests
@@ -80,6 +87,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.92.0
       - name: Build and sanity test
         run: |
           cd dcsctp-cxx/

src/packet/mod.rs

@@ -151,8 +151,6 @@ pub enum ChunkParseError {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
-
     #[test]
     fn read_big_endian() {
         let a = &[1, 2, 3, 4, 5, 6, 7, 8];