warning: use of deprecated function `deprecated_future`: text
  --> $DIR/deprecation-in-future.rs:9:5
   |
LL |     deprecated_future(); // ok; deprecated_in_future only applies with `#![feature(staged_api)]`
   |     ^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(deprecated)]` on by default

warning: 1 warning emitted

