warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/empty-requires.rs:3:12
   |
LL | #![feature(contracts)]
   |            ^^^^^^^^^
   |
   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
   = note: `#[warn(incomplete_features)]` on by default

error[E0308]: mismatched types
  --> $DIR/empty-requires.rs:9:1
   |
LL | #[requires()]
   | ^^^^^^^^^^^^^ expected `bool`, found `()`

error: aborting due to 1 previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0308`.