3 use core::future::Future;
5 use core::task::{Context, Poll};
19 impl Future for Struct {
21 fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> { Poll::Pending }
24 impl Future for Tuple {
26 fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> { Poll::Pending }
30 type Output = Result<(), ()>;
32 fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
37 async fn foo() -> Result<(), ()> {
41 async fn bar() -> Result<(), ()> {
42 foo()?; //~ ERROR the `?` operator can only be applied to values that implement `Try`
43 //~^ NOTE the `?` operator cannot be applied to type `impl Future`
44 //~| HELP the trait `Try` is not implemented for `impl Future`
45 //~| NOTE required by `into_result`
46 //~| HELP consider `await`ing on the `Future`
47 //~| NOTE in this expansion of desugaring of operator `?`
48 //~| NOTE in this expansion of desugaring of operator `?`
49 //~| NOTE in this expansion of desugaring of operator `?`
50 //~| NOTE in this expansion of desugaring of operator `?`
54 async fn struct_() -> Struct {
58 async fn tuple() -> Tuple {
59 //~^ NOTE checked the `Output` of this `async fn`, expected opaque type
63 async fn baz() -> Result<(), ()> {
65 t?; //~ ERROR the `?` operator can only be applied to values that implement `Try`
66 //~^ NOTE the `?` operator cannot be applied to type `T`
67 //~| HELP the trait `Try` is not implemented for `T`
68 //~| NOTE required by `into_result`
69 //~| HELP consider `await`ing on the `Future`
70 //~| NOTE in this expansion of desugaring of operator `?`
71 //~| NOTE in this expansion of desugaring of operator `?`
72 //~| NOTE in this expansion of desugaring of operator `?`
73 //~| NOTE in this expansion of desugaring of operator `?`
76 let _: i32 = tuple().0; //~ ERROR no field `0`
77 //~^ HELP consider `await`ing on the `Future`
78 //~| NOTE field not available in `impl Future`
80 let _: i32 = struct_().a; //~ ERROR no field `a`
81 //~^ HELP consider `await`ing on the `Future`
82 //~| NOTE field not available in `impl Future`
84 struct_().method(); //~ ERROR no method named
85 //~^ NOTE method not found in `impl Future`
86 //~| HELP consider `await`ing on the `Future`
91 match tuple() { //~ HELP consider `await`ing on the `Future`
92 Tuple(_) => {} //~ ERROR mismatched types
93 //~^ NOTE expected opaque type, found struct `Tuple`
94 //~| NOTE expected opaque type `impl Future`
95 //~| NOTE while checking the return type of the `async fn`