| warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes | |
| --> $DIR/basic.rs:5:12 | |
| | | |
| LL | #![feature(return_type_notation)] | |
| | ^^^^^^^^^^^^^^^^^^^^ | |
| | | |
| = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information | |
| = note: `#[warn(incomplete_features)]` on by default | |
| warning: 1 warning emitted | |