warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes --> $DIR/specialization-overlap-negative.rs:2:12 | LL | #![feature(specialization)] | ^^^^^^^^^^^^^^ | = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information = help: consider using `min_specialization` instead, which is more stable and complete = note: `#[warn(incomplete_features)]` on by default error[E0751]: found both positive and negative implementation of trait `Send` for type `TestType<_>`: --> $DIR/specialization-overlap-negative.rs:9:1 | LL | unsafe impl<T: Clone> Send for TestType<T> {} | ------------------------------------------ positive implementation here LL | impl<T: MyTrait> !Send for TestType<T> {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ negative implementation here error: aborting due to previous error; 1 warning emitted For more information about this error, try `rustc --explain E0751`.