error: an `#[unstable]` annotation here has no effect --> $DIR/stability-attribute-trait-impl.rs:25:1 | LL | #[unstable(feature = "h", issue = "none")] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `#[deny(ineffective_unstable_trait_impl)]` on by default = note: see issue #55436 for more information error: module has missing stability attribute --> $DIR/stability-attribute-trait-impl.rs:1:1 | LL | / #![feature(staged_api)] LL | | LL | | LL | | #[stable(feature = "a", since = "1")] ... | LL | | LL | | fn main() {} | |____________^ error: aborting due to 2 previous errors