Derive Default more rather than implement it

src/lib.rs

@@ -137,6 +137,12 @@ impl MutexId {
     }
 }
 
+impl Default for MutexId {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl fmt::Debug for MutexId {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "MutexID({:?})", self.0)

src/stdsync.rs

@@ -53,7 +53,7 @@ pub type DebugRwLock<T> = RwLock<T>;
 ///
 /// Refer to the [crate-level][`crate`] documentaiton for the differences between this struct and
 /// the one it wraps.
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct TracingMutex<T> {
     inner: Mutex<T>,
     id: MutexId,
@@ -139,12 +139,6 @@ impl<T> TracingMutex<T> {
     }
 }
 
-impl<T: ?Sized + Default> Default for TracingMutex<T> {
-    fn default() -> Self {
-        Self::new(T::default())
-    }
-}
-
 impl<T> From<T> for TracingMutex<T> {
     fn from(t: T) -> Self {
         Self::new(t)
@@ -241,12 +235,9 @@ impl<T> TracingRwLock<T> {
     }
 }
 
-impl<T> Default for TracingRwLock<T>
-where
-    T: Default,
-{
-    fn default() -> Self {
-        Self::new(T::default())
+impl<T> From<T> for TracingRwLock<T> {
+    fn from(t: T) -> Self {
+        Self::new(t)
     }
 }