nits

node/libs/concurrency/src/sync/mod.rs

@@ -48,7 +48,8 @@ impl<T> ops::DerefMut for LocalMutexGuard<'_, T> {
     }
 }
 
-/// Locks a mutex.
+/// Locks a mutex, returning a guard which is NOT Send
+/// (useful for ensuring that mutex is not held across await point).
 /// Note that depending on a use case you might
 /// want to wait unconditionally for a mutex to be locked
 /// (when a mutex is guaranteed to be unlocked fast).

node/libs/utils/src/no_copy.rs

@@ -3,7 +3,7 @@
 use std::ops;
 
 /// No-copy wrapper allowing to carry a `Copy` type into a closure or an `async` block.
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub struct NoCopy<T>(T);
 
 impl<T: Copy> NoCopy<T> {