error[E0311]: the parameter type `U` may not live long enough --> $DIR/async-generics.rs:9:28 | LL | async fn foo(&self) -> &(T, U); | ^^^^^^^ | note: the parameter type `U` must be valid for the anonymous lifetime as defined here... --> $DIR/async-generics.rs:9:18 | LL | async fn foo(&self) -> &(T, U); | ^ note: ...so that the reference type `&(T, U)` does not outlive the data it points at --> $DIR/async-generics.rs:9:28 | LL | async fn foo(&self) -> &(T, U); | ^^^^^^^ error[E0311]: the parameter type `T` may not live long enough --> $DIR/async-generics.rs:9:28 | LL | async fn foo(&self) -> &(T, U); | ^^^^^^^ | note: the parameter type `T` must be valid for the anonymous lifetime as defined here... --> $DIR/async-generics.rs:9:18 | LL | async fn foo(&self) -> &(T, U); | ^ note: ...so that the reference type `&(T, U)` does not outlive the data it points at --> $DIR/async-generics.rs:9:28 | LL | async fn foo(&self) -> &(T, U); | ^^^^^^^ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0311`.