#[cfg(feature = "hashbrown")]
pub use self::hashbrown::{HashMap, HashSet, hash_map};
}
+
+#[cfg(feature = "std")]
+mod sync {
+ pub use ::std::sync::{Arc, Mutex, Condvar, MutexGuard, RwLock, RwLockReadGuard};
+}
+
+#[cfg(not(feature = "std"))]
+mod sync;