error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now --> $DIR/feature-gate-negative_impls.rs:2:6 | LL | impl !MyTrait for u32 {} | ^^^^^^^^ | = note: see issue #68318 for more information = help: add `#![feature(negative_impls)]` to the crate attributes to enable error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0658`.