cognitive psychology. PhD 
Vec<&YourTrait> not working?
-
This Tweet is unavailable.
-
This Tweet is unavailable.
-
This Tweet is unavailable.
-
This Tweet is unavailable.
-
Sync is just a compile-time safety check, saying you can't send types like &Rc between threads. The only sync cost is atomic refcount increment when you .clone() the Arc<..>, which should be once up front per thread. Locking always happens explicitly in Rust (mutex.lock()).
Unlike C++, where I once deadlocked the numpy C++ API b/c C++ implicitly locks a mutex while initializing static variables... never again