chore: fix new Clippy lints in Rust 1.83.0 (tokio-rs#3165)

Most of these changes are places where lifetimes were named, but can be
elided. Then a few cases where a lifetime was elided, but actually
resolves to a named lifetime. So lots of lifetimes.

This is the `v0.1.x` branch sister PR to tokio-rs#3164 (for the `master`
branch), since `clippy --fix` on another branch is a much better way to
apply these changes than backporting.

Author: hds

examples/examples/counters.rs

@@ -28,7 +28,7 @@ struct Count<'a> {
     counters: RwLockReadGuard<'a, HashMap<String, AtomicUsize>>,
 }
 
-impl<'a> Visit for Count<'a> {
+impl Visit for Count<'_> {
     fn record_i64(&mut self, field: &Field, value: i64) {
         if let Some(counter) = self.counters.get(field.name()) {
             if value > 0 {

examples/examples/sloggish/sloggish_subscriber.rs

@@ -86,7 +86,7 @@ struct Event<'a> {
 
 struct ColorLevel<'a>(&'a Level);
 
-impl<'a> fmt::Display for ColorLevel<'a> {
+impl fmt::Display for ColorLevel<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self.0 {
             Level::TRACE => Color::Purple.paint("TRACE"),
@@ -116,7 +116,7 @@ impl Visit for Span {
     }
 }
 
-impl<'a> Visit for Event<'a> {
+impl Visit for Event<'_> {
     fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
         write!(
             &mut self.stderr,

tracing-appender/benches/bench.rs

@@ -18,7 +18,7 @@ impl NoOpWriter {
     }
 }
 
-impl<'a> MakeWriter<'a> for NoOpWriter {
+impl MakeWriter<'_> for NoOpWriter {
     type Writer = NoOpWriter;
 
     fn make_writer(&self) -> Self::Writer {

tracing-appender/src/rolling.rs

@@ -70,7 +70,7 @@ pub use builder::{Builder, InitError};
 ///
 /// // Log all events to a rolling log file.
 /// let logfile = tracing_appender::rolling::hourly("/logs", "myapp-logs");
-
+///
 /// // Log `INFO` and above to stdout.
 /// let stdout = std::io::stdout.with_max_level(tracing::Level::INFO);
 ///

tracing-attributes/src/expand.rs

@@ -772,7 +772,7 @@ struct IdentAndTypesRenamer<'a> {
     idents: Vec<(Ident, Ident)>,
 }
 
-impl<'a> VisitMut for IdentAndTypesRenamer<'a> {
+impl VisitMut for IdentAndTypesRenamer<'_> {
     // we deliberately compare strings because we want to ignore the spans
     // If we apply clippy's lint, the behavior changes
     #[allow(clippy::cmp_owned)]
@@ -801,7 +801,7 @@ struct AsyncTraitBlockReplacer<'a> {
     patched_block: Block,
 }
 
-impl<'a> VisitMut for AsyncTraitBlockReplacer<'a> {
+impl VisitMut for AsyncTraitBlockReplacer<'_> {
     fn visit_block_mut(&mut self, i: &mut Block) {
         if i == self.block {
             *i = self.patched_block.clone();

tracing-core/src/dispatcher.rs

@@ -879,7 +879,7 @@ impl<'a> Entered<'a> {
 }
 
 #[cfg(feature = "std")]
-impl<'a> Drop for Entered<'a> {
+impl Drop for Entered<'_> {
     #[inline]
     fn drop(&mut self) {
         self.0.can_enter.set(true);

tracing-core/src/field.rs

@@ -387,7 +387,7 @@ where
 
 struct HexBytes<'a>(&'a [u8]);
 
-impl<'a> fmt::Debug for HexBytes<'a> {
+impl fmt::Debug for HexBytes<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.write_char('[')?;
 
@@ -407,13 +407,13 @@ impl<'a> fmt::Debug for HexBytes<'a> {
 
 // ===== impl Visit =====
 
-impl<'a, 'b> Visit for fmt::DebugStruct<'a, 'b> {
+impl Visit for fmt::DebugStruct<'_, '_> {
     fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
         self.field(field.name(), value);
     }
 }
 
-impl<'a, 'b> Visit for fmt::DebugMap<'a, 'b> {
+impl Visit for fmt::DebugMap<'_, '_> {
     fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
         self.entry(&format_args!("{}", field), value);
     }
@@ -641,9 +641,9 @@ where
     }
 }
 
-impl<'a> crate::sealed::Sealed for fmt::Arguments<'a> {}
+impl crate::sealed::Sealed for fmt::Arguments<'_> {}
 
-impl<'a> Value for fmt::Arguments<'a> {
+impl Value for fmt::Arguments<'_> {
     fn record(&self, key: &Field, visitor: &mut dyn Visit) {
         visitor.record_debug(key, self)
     }
@@ -938,7 +938,7 @@ impl FieldSet {
     }
 }
 
-impl<'a> IntoIterator for &'a FieldSet {
+impl IntoIterator for &FieldSet {
     type IntoIter = Iter;
     type Item = Field;
     #[inline]
@@ -1017,7 +1017,7 @@ impl Iterator for Iter {
 
 // ===== impl ValueSet =====
 
-impl<'a> ValueSet<'a> {
+impl ValueSet<'_> {
     /// Returns an [`Identifier`] that uniquely identifies the [`Callsite`]
     /// defining the fields this `ValueSet` refers to.
     ///
@@ -1078,7 +1078,7 @@ impl<'a> ValueSet<'a> {
     }
 }
 
-impl<'a> fmt::Debug for ValueSet<'a> {
+impl fmt::Debug for ValueSet<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.values
             .iter()
@@ -1093,7 +1093,7 @@ impl<'a> fmt::Debug for ValueSet<'a> {
     }
 }
 
-impl<'a> fmt::Display for ValueSet<'a> {
+impl fmt::Display for ValueSet<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.values
             .iter()

tracing-core/src/metadata.rs

@@ -191,7 +191,7 @@ pub struct Kind(u8);
 ///         // ...
 ///         # drop(span); Id::from_u64(1)
 ///     }
-
+///
 ///     fn event(&self, event: &Event<'_>) {
 ///         // ...
 ///         # drop(event);
@@ -332,7 +332,7 @@ impl<'a> Metadata<'a> {
     }
 }
 
-impl<'a> fmt::Debug for Metadata<'a> {
+impl fmt::Debug for Metadata<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut meta = f.debug_struct("Metadata");
         meta.field("name", &self.name)
@@ -440,9 +440,9 @@ impl fmt::Debug for Kind {
     }
 }
 
-impl<'a> Eq for Metadata<'a> {}
+impl Eq for Metadata<'_> {}
 
-impl<'a> PartialEq for Metadata<'a> {
+impl PartialEq for Metadata<'_> {
     #[inline]
     fn eq(&self, other: &Self) -> bool {
         if core::ptr::eq(&self, &other) {

tracing-error/src/backtrace.rs

@@ -227,7 +227,7 @@ impl fmt::Debug for SpanTrace {
             fields: &'a str,
         }
 
-        impl<'a> fmt::Debug for DebugSpan<'a> {
+        impl fmt::Debug for DebugSpan<'_> {
             fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                 write!(
                     f,

tracing-log/src/lib.rs

@@ -212,7 +212,7 @@ pub trait AsTrace: crate::sealed::Sealed {
     fn as_trace(&self) -> Self::Trace;
 }
 
-impl<'a> crate::sealed::Sealed for Metadata<'a> {}
+impl crate::sealed::Sealed for Metadata<'_> {}
 
 impl<'a> AsLog for Metadata<'a> {
     type Log = log::Metadata<'a>;
@@ -223,7 +223,7 @@ impl<'a> AsLog for Metadata<'a> {
             .build()
     }
 }
-impl<'a> crate::sealed::Sealed for log::Metadata<'a> {}
+impl crate::sealed::Sealed for log::Metadata<'_> {}
 
 impl<'a> AsTrace for log::Metadata<'a> {
     type Trace = Metadata<'a>;
@@ -353,7 +353,7 @@ fn loglevel_to_cs(
     }
 }
 
-impl<'a> crate::sealed::Sealed for log::Record<'a> {}
+impl crate::sealed::Sealed for log::Record<'_> {}
 
 impl<'a> AsTrace for log::Record<'a> {
     type Trace = Metadata<'a>;
@@ -464,7 +464,7 @@ pub trait NormalizeEvent<'a>: crate::sealed::Sealed {
     fn is_log(&self) -> bool;
 }
 
-impl<'a> crate::sealed::Sealed for Event<'a> {}
+impl crate::sealed::Sealed for Event<'_> {}
 
 impl<'a> NormalizeEvent<'a> for Event<'a> {
     fn normalized_metadata(&'a self) -> Option<Metadata<'a>> {
@@ -516,7 +516,7 @@ impl<'a> LogVisitor<'a> {
     }
 }
 
-impl<'a> Visit for LogVisitor<'a> {
+impl Visit for LogVisitor<'_> {
     fn record_debug(&mut self, _field: &Field, _value: &dyn fmt::Debug) {}
 
     fn record_u64(&mut self, field: &Field, value: u64) {