| warning: trait objects without an explicit `dyn` are deprecated | 
 |   --> $DIR/fresh-lifetime-from-bare-trait-obj-114664.rs:5:24 | 
 |    | | 
 | LL | fn ice() -> impl AsRef<Fn(&())> { | 
 |    |                        ^^^^^^^ | 
 |    | | 
 |    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! | 
 |    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html> | 
 |    = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default | 
 | help: if this is a dyn-compatible trait, use `dyn` | 
 |    | | 
 | LL | fn ice() -> impl AsRef<dyn Fn(&())> { | 
 |    |                        +++ | 
 |  | 
 | warning: trait objects without an explicit `dyn` are deprecated | 
 |   --> $DIR/fresh-lifetime-from-bare-trait-obj-114664.rs:5:24 | 
 |    | | 
 | LL | fn ice() -> impl AsRef<Fn(&())> { | 
 |    |                        ^^^^^^^ | 
 |    | | 
 |    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! | 
 |    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html> | 
 |    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` | 
 | help: if this is a dyn-compatible trait, use `dyn` | 
 |    | | 
 | LL | fn ice() -> impl AsRef<dyn Fn(&())> { | 
 |    |                        +++ | 
 |  | 
 | warning: 2 warnings emitted | 
 |  |