src/http/mod.rs:94 on os X 10.11.6

[zhiyuan-liao]

chain.link_before(Write::::one(Box::new(engine)));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait persistent::PersistentInto<std::sync::Arc<std::sync::Mutex<std::boxed::Box<engine::SemanticEngine + std::marker::Sync + std::marker::Send + 'static>>>> is not implemented for std::boxed::Box<E>

[ethe]

I got the same error.