warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes --> $DIR/trait_specialization.rs:7:12 | LL | #![feature(specialization)] | ^^^^^^^^^^^^^^ | = note: see issue #31844 for more information = help: consider using `min_specialization` instead, which is more stable and complete = note: `#[warn(incomplete_features)]` on by default warning: 1 warning emitted