From 21a1054dd406dc38871f14e8b5a75a9bc8562d82 Mon Sep 17 00:00:00 2001
From: Caio <c410.f3r@gmail.com>
Date: Thu, 2 Feb 2023 11:18:18 -0300
Subject: [PATCH 1/2] Mark `MutexGuard` with `#[clippy::has_significant_drop]`

`#[clippy::has_significant_drop]` tells that a structure should be considered when evaluating some lints. Examples of such behavior are the existent `clippy::significant_drop_in_scrutinee` and in the soon-to-be-finished https://github.com/rust-lang/rust-clippy/issues/9399.
---
 src/mutex.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mutex.rs b/src/mutex.rs
index 142dc86..aee2d8f 100644
--- a/src/mutex.rs
+++ b/src/mutex.rs
@@ -536,6 +536,7 @@ impl<T: ?Sized, B: Borrow<Mutex<T>>> Drop for AcquireSlow<B, T> {
 }
 
 /// A guard that releases the mutex when dropped.
+#[clippy::has_significant_drop]
 pub struct MutexGuard<'a, T: ?Sized>(&'a Mutex<T>);
 
 unsafe impl<T: Send + ?Sized> Send for MutexGuard<'_, T> {}

From 0f9507d69151daba3b6623d570f1849bace26ebc Mon Sep 17 00:00:00 2001
From: Caio <c410.f3r@gmail.com>
Date: Fri, 3 Feb 2023 21:41:11 +0000
Subject: [PATCH 2/2] Include more structures

---
 src/mutex.rs     | 1 +
 src/rwlock.rs    | 3 +++
 src/semaphore.rs | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/src/mutex.rs b/src/mutex.rs
index aee2d8f..7087dd8 100644
--- a/src/mutex.rs
+++ b/src/mutex.rs
@@ -596,6 +596,7 @@ impl<T: ?Sized> DerefMut for MutexGuard<'_, T> {
 }
 
 /// An owned guard that releases the mutex when dropped.
+#[clippy::has_significant_drop]
 pub struct MutexGuardArc<T: ?Sized>(Arc<Mutex<T>>);
 
 unsafe impl<T: Send + ?Sized> Send for MutexGuardArc<T> {}
diff --git a/src/rwlock.rs b/src/rwlock.rs
index 53bc871..a1b9154 100644
--- a/src/rwlock.rs
+++ b/src/rwlock.rs
@@ -604,6 +604,7 @@ impl<'a, T: ?Sized> Future for Write<'a, T> {
 }
 
 /// A guard that releases the read lock when dropped.
+#[clippy::has_significant_drop]
 pub struct RwLockReadGuard<'a, T: ?Sized>(&'a RwLock<T>);
 
 unsafe impl<T: Sync + ?Sized> Send for RwLockReadGuard<'_, T> {}
@@ -640,6 +641,7 @@ impl<T: ?Sized> Deref for RwLockReadGuard<'_, T> {
 }
 
 /// A guard that releases the upgradable read lock when dropped.
+#[clippy::has_significant_drop]
 pub struct RwLockUpgradableReadGuard<'a, T: ?Sized> {
     reader: RwLockReadGuard<'a, T>,
     reserved: MutexGuard<'a, ()>,
@@ -851,6 +853,7 @@ impl<T: ?Sized> Drop for RwLockWriteGuardInner<'_, T> {
 }
 
 /// A guard that releases the write lock when dropped.
+#[clippy::has_significant_drop]
 pub struct RwLockWriteGuard<'a, T: ?Sized> {
     writer: RwLockWriteGuardInner<'a, T>,
     reserved: MutexGuard<'a, ()>,
diff --git a/src/semaphore.rs b/src/semaphore.rs
index 4174781..0de4f53 100644
--- a/src/semaphore.rs
+++ b/src/semaphore.rs
@@ -244,6 +244,7 @@ impl Future for AcquireArc {
 }
 
 /// A guard that releases the acquired permit.
+#[clippy::has_significant_drop]
 #[derive(Debug)]
 pub struct SemaphoreGuard<'a>(&'a Semaphore);
 
@@ -255,6 +256,7 @@ impl Drop for SemaphoreGuard<'_> {
 }
 
 /// An owned guard that releases the acquired permit.
+#[clippy::has_significant_drop]
 #[derive(Debug)]
 pub struct SemaphoreGuardArc(Arc<Semaphore>);