error: `dyn B` implements `Deref` with supertrait `A` as output --> $DIR/migrate-lint-deny.rs:20:12 | LL | take_a(b) | ^ | = 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 #89460 note: the lint level is defined here --> $DIR/migrate-lint-deny.rs:1:9 | LL | #![deny(deref_into_dyn_supertrait)] | ^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error