error: trait objects without an explicit `dyn` are deprecated --> $DIR/dyn-angle-brackets.rs:15:10 | LL | ::fmt(self, f) | ^^^^^^^^^^ | = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! = note: for more information, see note: the lint level is defined here --> $DIR/dyn-angle-brackets.rs:4:9 | LL | #![deny(bare_trait_objects)] | ^^^^^^^^^^^^^^^^^^ help: use `dyn` | LL | ::fmt(self, f) | +++ error: aborting due to previous error