tests/ui/self/arbitrary_self_types_pin_lifetime-async.rs

   1 // check-pass
   2 // edition:2018
   3
   4 use std::pin::Pin;
   5 use std::task::{Context, Poll};
   6
   7 struct Foo;
   8
   9 impl Foo {
  10     async fn pin_ref(self: Pin<&Self>) -> Pin<&Self> { self }
  11
  12     async fn pin_mut(self: Pin<&mut Self>) -> Pin<&mut Self> { self }
  13
  14     async fn pin_pin_pin_ref(self: Pin<Pin<Pin<&Self>>>) -> Pin<Pin<Pin<&Self>>> { self }
  15
  16     async fn pin_ref_impl_trait(self: Pin<&Self>) -> impl Clone + '_ { self }
  17
  18     fn b(self: Pin<&Foo>, f: &Foo) -> Pin<&Foo> { self }
  19 }
  20
  21 type Alias<T> = Pin<T>;
  22 impl Foo {
  23     async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> Alias<&Self> { self }
  24 }
  25
  26 // FIXME(Centril): extend with the rest of the non-`async fn` test
  27 // when we allow `async fn`s inside traits and trait implementations.
  28
  29 fn main() {
  30     let mut foo = Foo;
  31     { Pin::new(&foo).pin_ref() };
  32     { Pin::new(&mut foo).pin_mut() };
  33     { Pin::new(Pin::new(Pin::new(&foo))).pin_pin_pin_ref() };
  34     { Pin::new(&foo).pin_ref_impl_trait() };
  35 }