error: use of unstable library feature 'test': `bench` is a part of custom test frameworks which are unstable --> $DIR/bench.rs:3:3 | LL | #[bench] | ^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #64266 = note: `#[deny(soft_unstable)]` on by default error: use of unstable library feature 'test': `bench` is a part of custom test frameworks which are unstable --> $DIR/bench.rs:7:5 | LL | use bench as _; | ^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #64266 error: aborting due to 2 previous errors Future incompatibility report: Future breakage diagnostic: error: use of unstable library feature 'test': `bench` is a part of custom test frameworks which are unstable --> $DIR/bench.rs:3:3 | LL | #[bench] | ^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #64266 = note: `#[deny(soft_unstable)]` on by default Future breakage diagnostic: error: use of unstable library feature 'test': `bench` is a part of custom test frameworks which are unstable --> $DIR/bench.rs:7:5 | LL | use bench as _; | ^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #64266 = note: `#[deny(soft_unstable)]` on by default