error[E0658]: precise captures on `impl Trait` are experimental
  --> $DIR/feature-gate-precise-capturing.rs:1:20
   |
LL | fn hello() -> impl use<> Sized {}
   |                    ^^^
   |
   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
   = help: add `#![feature(precise_capturing)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0658`.