narcissus-core: Remove unnecessary trait bound

diff --git a/engine/narcissus-core/src/mutex.rs b/engine/narcissus-core/src/mutex.rs
index d0b3ca64097560187fa80d2bc9f56dc3277e192d..82a54c61951e7828d84123d3255544c4e4760ccb 100644 (file)
--- a/engine/narcissus-core/src/mutex.rs
+++ b/engine/narcissus-core/src/mutex.rs
@@ -199,7 +199,7 @@ impl<T: ?Sized> Mutex<T> {
     }
 }
 
-impl<T: ?Sized + Default> Default for Mutex<T> {
+impl<T: Default> Default for Mutex<T> {
     fn default() -> Mutex<T> {
         Mutex::new(Default::default())
     }