error[E0425]: cannot find value `u` in this scope
  --> $DIR/issues-71798.rs:7:24
   |
LL |     let _ = test_ref & u;
   |                        ^ not found in this scope

error[E0277]: `u32` is not a future
  --> $DIR/issues-71798.rs:1:25
   |
LL | fn test_ref(x: &u32) -> impl std::future::Future<Output = u32> + '_ {
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `u32` is not a future
LL |
LL |     *x
   |     -- return type was inferred to be `u32` here
   |
   = help: the trait `Future` is not implemented for `u32`
   = note: u32 must be a future or must implement `IntoFuture` to be awaited

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0425.
For more information about an error, try `rustc --explain E0277`.