From 858e3a5043e52e5cac0f33c6d453ecba021b76ad Mon Sep 17 00:00:00 2001
From: crumblingstatue <radiantstatue@gmail.com>
Date: Mon, 13 May 2024 12:49:31 +0200
Subject: [PATCH] Make `epaint::mutex::RwLock` allow `?Sized` types (#4485)

`parking_lot`'s `RwLock` allows this, so probably `epaint`'s `RwLock`
should too.
Although I'm not sure how much it's intended for users, rather than just
internal use by `egui`.
---
 crates/epaint/src/mutex.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crates/epaint/src/mutex.rs b/crates/epaint/src/mutex.rs
index 2c61f038f9c..157701c2be0 100644
--- a/crates/epaint/src/mutex.rs
+++ b/crates/epaint/src/mutex.rs
@@ -133,14 +133,16 @@ mod rw_lock_impl {
     /// the feature `deadlock_detection` is turned enabled, in which case
     /// extra checks are added to detect deadlocks.
     #[derive(Default)]
-    pub struct RwLock<T>(parking_lot::RwLock<T>);
+    pub struct RwLock<T: ?Sized>(parking_lot::RwLock<T>);
 
     impl<T> RwLock<T> {
         #[inline(always)]
         pub fn new(val: T) -> Self {
             Self(parking_lot::RwLock::new(val))
         }
+    }
 
+    impl<T: ?Sized> RwLock<T> {
         #[inline(always)]
         pub fn read(&self) -> RwLockReadGuard<'_, T> {
             parking_lot::RwLockReadGuard::map(self.0.read(), |v| v)