diff --git a/cli/src/formatter.rs b/cli/src/formatter.rs
index 400597395b..20133f07dd 100644
--- a/cli/src/formatter.rs
+++ b/cli/src/formatter.rs
@@ -648,7 +648,7 @@ impl Write for FormatRecorder {
 
 struct RawEscapeSequenceRecorder<'a>(&'a mut FormatRecorder);
 
-impl<'a> Write for RawEscapeSequenceRecorder<'a> {
+impl Write for RawEscapeSequenceRecorder<'_> {
     fn write(&mut self, data: &[u8]) -> io::Result<usize> {
         self.0.push_op(FormatOp::RawEscapeSequence(data.to_vec()));
         Ok(data.len())
diff --git a/cli/src/graphlog.rs b/cli/src/graphlog.rs
index ec9a33f60f..fc0fb0cb27 100644
--- a/cli/src/graphlog.rs
+++ b/cli/src/graphlog.rs
@@ -57,7 +57,7 @@ impl<K: Clone> From<&Edge<K>> for Ancestor<K> {
     }
 }
 
-impl<'writer, K, R> GraphLog<K> for SaplingGraphLog<'writer, R>
+impl<K, R> GraphLog<K> for SaplingGraphLog<'_, R>
 where
     K: Clone + Eq + Hash,
     R: Renderer<K, Output = String>,
diff --git a/lib/src/default_index/revset_engine.rs b/lib/src/default_index/revset_engine.rs
index ca3678dcc0..6af05edb90 100644
--- a/lib/src/default_index/revset_engine.rs
+++ b/lib/src/default_index/revset_engine.rs
@@ -752,7 +752,7 @@ fn to_u32_generation_range(range: &Range<u64>) -> Result<Range<u32>, RevsetEvalu
     Ok(start..end)
 }
 
-impl<'index> EvaluationContext<'index> {
+impl EvaluationContext<'_> {
     fn evaluate(
         &self,
         expression: &ResolvedExpression,
diff --git a/lib/src/diff.rs b/lib/src/diff.rs
index 4903aa2ecc..c3c7c95aba 100644
--- a/lib/src/diff.rs
+++ b/lib/src/diff.rs
@@ -850,7 +850,7 @@ impl<'diff, 'input> DiffHunkIterator<'diff, 'input> {
     }
 }
 
-impl<'diff, 'input> Iterator for DiffHunkIterator<'diff, 'input> {
+impl<'input> Iterator for DiffHunkIterator<'_, 'input> {
     type Item = DiffHunk<'input>;
 
     fn next(&mut self) -> Option<Self::Item> {
diff --git a/lib/src/files.rs b/lib/src/files.rs
index ebb5ba31ff..f0171d49e1 100644
--- a/lib/src/files.rs
+++ b/lib/src/files.rs
@@ -109,7 +109,7 @@ where
     }
 }
 
-impl<'a, I> DiffLineIterator<'a, I> {
+impl<I> DiffLineIterator<'_, I> {
     /// Returns line number of the next hunk. After all hunks are consumed, this
     /// returns the next line number if the last hunk ends with newline.
     pub fn next_line_number(&self) -> DiffLineNumber {
diff --git a/lib/src/id_prefix.rs b/lib/src/id_prefix.rs
index 8a0458eb23..0e2f1f39f8 100644
--- a/lib/src/id_prefix.rs
+++ b/lib/src/id_prefix.rs
@@ -448,7 +448,7 @@ pub struct IdIndexLookup<'i, 'q, K, P, S, const N: usize> {
     pos: usize, // may be index.len()
 }
 
-impl<'i, 'q, K, P, S, const N: usize> IdIndexLookup<'i, 'q, K, P, S, N>
+impl<K, P, S, const N: usize> IdIndexLookup<'_, '_, K, P, S, N>
 where
     K: ObjectId + Eq,
     S: IdIndexSource<P>,
diff --git a/lib/src/revset.rs b/lib/src/revset.rs
index e32d8738ee..a2bd0af997 100644
--- a/lib/src/revset.rs
+++ b/lib/src/revset.rs
@@ -2225,7 +2225,7 @@ pub trait RevsetIteratorExt<'index, I> {
     fn reversed(self) -> ReverseRevsetIterator;
 }
 
-impl<'index, I: Iterator<Item = CommitId>> RevsetIteratorExt<'index, I> for I {
+impl<I: Iterator<Item = CommitId>> RevsetIteratorExt<'_, I> for I {
     fn commits(self, store: &Arc<Store>) -> RevsetCommitIterator<I> {
         RevsetCommitIterator {
             iter: self,
diff --git a/lib/src/workspace.rs b/lib/src/workspace.rs
index dbcd359c60..cb0a2843f6 100644
--- a/lib/src/workspace.rs
+++ b/lib/src/workspace.rs
@@ -461,7 +461,7 @@ pub struct LockedWorkspace<'a> {
     locked_wc: Box<dyn LockedWorkingCopy>,
 }
 
-impl<'a> LockedWorkspace<'a> {
+impl LockedWorkspace<'_> {
     pub fn locked_wc(&mut self) -> &mut dyn LockedWorkingCopy {
         self.locked_wc.as_mut()
     }