Bump Rust ci

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.87.0
+      - uses: dtolnay/rust-toolchain@1.89.0
       - run: cargo build
       - run: cargo test
 
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.87.0
+      - uses: dtolnay/rust-toolchain@1.89.0
         with:
           components: clippy, rustfmt
       - uses: Swatinem/rust-cache@v2

src/chunk.rs

@@ -222,7 +222,9 @@ impl ChunksExt for [Spanned<Chunk>] {
 
 /// An iterator over the characters in each chunk, indicating whether they are
 /// verbatim or not. Chunk types other than `Normal` or `Verbatim` are omitted.
-pub(crate) fn chunk_chars(chunks: ChunksRef) -> impl Iterator<Item = (char, bool)> + '_ {
+pub(crate) fn chunk_chars(
+    chunks: ChunksRef<'_>,
+) -> impl Iterator<Item = (char, bool)> + '_ {
     chunks.iter().flat_map(|chunk| {
         let (s, verbatim) = chunk.v.get_and_verb();
 

src/lib.rs

@@ -233,12 +233,12 @@ impl Bibliography {
     }
 
     /// An iterator over the bibliography's entries.
-    pub fn iter(&self) -> std::slice::Iter<Entry> {
+    pub fn iter(&'_ self) -> std::slice::Iter<'_, Entry> {
         self.entries.iter()
     }
 
     /// A mutable iterator over the bibliography's entries.
-    pub fn iter_mut(&mut self) -> std::slice::IterMut<Entry> {
+    pub fn iter_mut(&'_ mut self) -> std::slice::IterMut<'_, Entry> {
         self.entries.iter_mut()
     }
 
@@ -311,7 +311,7 @@ impl Entry {
     /// Get the chunk slice of a field.
     ///
     /// The field key must be lowercase.
-    pub fn get(&self, key: &str) -> Option<ChunksRef> {
+    pub fn get(&'_ self, key: &str) -> Option<ChunksRef<'_>> {
         self.fields.get(key).map(AsRef::as_ref)
     }
 
@@ -588,7 +588,7 @@ impl Entry {
     }
 
     /// Get an entry but return None for empty chunk slices.
-    fn get_non_empty(&self, key: &str) -> Option<ChunksRef> {
+    fn get_non_empty(&'_ self, key: &str) -> Option<ChunksRef<'_>> {
         let entry = self.get(key)?;
         if !entry.is_empty() {
             Some(entry)

src/macros.rs

@@ -13,7 +13,7 @@ macro_rules! fields {
         })*
     };
 
-    (@ret) => {ChunksRef};
+    (@ret) => {ChunksRef<'_>};
     (@ret $ret:ty) => {$ret};
 
     (@set $name:ident => $field:literal, ) => {