error[E0599]: no method named `poll` found for struct `Sleep` in the current scope --> $DIR/pin-needed-to-poll.rs:42:20 | LL | struct Sleep; | ------------ method `poll` not found for this struct ... LL | self.sleep.poll(cx) | ^^^^ method not found in `Sleep` | ::: $SRC_DIR/core/src/future/future.rs:LL:COL | LL | fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll; | ---- the method is available for `Pin<&mut Sleep>` here | help: consider wrapping the receiver expression with the appropriate type | LL | Pin::new(&mut self.sleep).poll(cx) | +++++++++++++ + error: aborting due to previous error For more information about this error, try `rustc --explain E0599`.