#![feature(negative_impls)] use std::marker::Copy; enum TestE { A, } struct MyType; struct NotSync; impl !Sync for NotSync {} unsafe impl Send for TestE {} unsafe impl Send for MyType {} unsafe impl Send for (MyType, MyType) {} //~^ ERROR E0117 unsafe impl Send for &'static NotSync {} //~^ ERROR E0321 unsafe impl Send for [MyType] {} //~^ ERROR E0117 unsafe impl Send for &'static [NotSync] {} //~^ ERROR only traits defined in the current crate fn main() {}