// edition:2018 #![allow(non_snake_case)] #![feature(arbitrary_self_types)] use std::marker::PhantomData; use std::ops::Deref; use std::pin::Pin; struct Struct { } struct Wrap<T, P>(T, PhantomData<P>); impl<T, P> Deref for Wrap<T, P> { type Target = T; fn deref(&self) -> &T { &self.0 } } impl Struct { // Test using `&self` sugar: async fn ref_self(&self, f: &u32) -> &u32 { f //~^ ERROR lifetime may not live long enough } // Test using `&Self` explicitly: async fn ref_Self(self: &Self, f: &u32) -> &u32 { f //~^ ERROR lifetime may not live long enough } async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 { f //~^ ERROR lifetime may not live long enough } async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 { f //~^ ERROR lifetime may not live long enough } async fn box_box_ref_Self(self: Box<Box<&Self>>, f: &u32) -> &u32 { f //~^ ERROR lifetime may not live long enough } async fn box_pin_ref_Self(self: Box<Pin<&Self>>, f: &u32) -> &u32 { f //~^ ERROR lifetime may not live long enough } async fn wrap_ref_Self_Self(self: Wrap<&Self, Self>, f: &u8) -> &u8 { f //~^ ERROR lifetime may not live long enough } } fn main() { }