chore: Fix warnings for Rust 1.89 (#32378)

Closes #ISSUE

Release Notes:

- N/A

crates/gpui/src/app.rs

@@ -64,7 +64,7 @@ pub struct AppCell {
 impl AppCell {
     #[doc(hidden)]
     #[track_caller]
-    pub fn borrow(&self) -> AppRef {
+    pub fn borrow(&self) -> AppRef<'_> {
         if option_env!("TRACK_THREAD_BORROWS").is_some() {
             let thread_id = std::thread::current().id();
             eprintln!("borrowed {thread_id:?}");
@@ -74,7 +74,7 @@ impl AppCell {
 
     #[doc(hidden)]
     #[track_caller]
-    pub fn borrow_mut(&self) -> AppRefMut {
+    pub fn borrow_mut(&self) -> AppRefMut<'_> {
         if option_env!("TRACK_THREAD_BORROWS").is_some() {
             let thread_id = std::thread::current().id();
             eprintln!("borrowed {thread_id:?}");
@@ -84,7 +84,7 @@ impl AppCell {
 
     #[doc(hidden)]
     #[track_caller]
-    pub fn try_borrow_mut(&self) -> Result<AppRefMut, BorrowMutError> {
+    pub fn try_borrow_mut(&self) -> Result<AppRefMut<'_>, BorrowMutError> {
         if option_env!("TRACK_THREAD_BORROWS").is_some() {
             let thread_id = std::thread::current().id();
             eprintln!("borrowed {thread_id:?}");

crates/gpui/src/platform.rs

@@ -718,7 +718,7 @@ impl<T> ops::Index<usize> for AtlasTextureList<T> {
 
 impl<T> AtlasTextureList<T> {
     #[allow(unused)]
-    fn drain(&mut self) -> std::vec::Drain<Option<T>> {
+    fn drain(&mut self) -> std::vec::Drain<'_, Option<T>> {
         self.free_list.clear();
         self.textures.drain(..)
     }

crates/gpui/src/platform/mac/events.rs

@@ -25,7 +25,7 @@ pub(crate) const ESCAPE_KEY: u16 = 0x1b;
 const TAB_KEY: u16 = 0x09;
 const SHIFT_TAB_KEY: u16 = 0x19;
 
-pub fn key_to_native(key: &str) -> Cow<str> {
+pub fn key_to_native(key: &str) -> Cow<'_, str> {
     use cocoa::appkit::*;
     let code = match key {
         "space" => SPACE_KEY,

crates/gpui/src/scene.rs

@@ -149,7 +149,7 @@ impl Scene {
         ),
         allow(dead_code)
     )]
-    pub(crate) fn batches(&self) -> impl Iterator<Item = PrimitiveBatch> {
+    pub(crate) fn batches(&self) -> impl Iterator<Item = PrimitiveBatch<'_>> {
         BatchIterator {
             shadows: &self.shadows,
             shadows_start: 0,

crates/gpui/src/text_system/line_layout.rs

@@ -616,7 +616,7 @@ impl Hash for (dyn AsCacheKeyRef + '_) {
 }
 
 impl AsCacheKeyRef for CacheKey {
-    fn as_cache_key_ref(&self) -> CacheKeyRef {
+    fn as_cache_key_ref(&self) -> CacheKeyRef<'_> {
         CacheKeyRef {
             text: &self.text,
             font_size: self.font_size,
@@ -645,7 +645,7 @@ impl<'a> Borrow<dyn AsCacheKeyRef + 'a> for Arc<CacheKey> {
 }
 
 impl AsCacheKeyRef for CacheKeyRef<'_> {
-    fn as_cache_key_ref(&self) -> CacheKeyRef {
+    fn as_cache_key_ref(&self) -> CacheKeyRef<'_> {
         *self
     }
 }