Skip to content

Commit

Permalink
Rollup merge of #103342 - Rageking8:add-test-for-issue-98634, r=compi…
Browse files Browse the repository at this point in the history
…ler-errors

Add test for issue 98634

Fixes #98634
  • Loading branch information
matthiaskrgr authored Oct 29, 2022
2 parents b3ca68f + 92b314b commit 67c469f
Show file tree
Hide file tree
Showing 2 changed files with 110 additions and 0 deletions.
50 changes: 50 additions & 0 deletions src/test/ui/async-await/issue-98634.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,50 @@
// edition: 2021

use std::{
future::Future,
pin::Pin,
task::{Context, Poll, Waker},
};

pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
pub callback: F,
}

impl<F> Future for StructAsync<F>
where
F: Fn() -> Pin<Box<dyn Future<Output = ()>>>,
{
type Output = ();

fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Self::Output> {
Poll::Pending
}
}

async fn callback() {}

struct Runtime;

fn waker() -> &'static Waker {
todo!()
}

impl Runtime {
#[track_caller]
pub fn block_on<F: Future>(&self, mut future: F) -> F::Output {
loop {
unsafe {
Pin::new_unchecked(&mut future).poll(&mut Context::from_waker(waker()));
}
}
}
}

fn main() {
Runtime.block_on(async {
StructAsync { callback }.await;
//~^ ERROR expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
//~| ERROR expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
//~| ERROR expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
});
}
60 changes: 60 additions & 0 deletions src/test/ui/async-await/issue-98634.stderr
Original file line number Diff line number Diff line change
@@ -0,0 +1,60 @@
error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
--> $DIR/issue-98634.rs:45:23
|
LL | StructAsync { callback }.await;
| ^^^^^^^^ expected struct `Pin`, found opaque type
|
note: while checking the return type of the `async fn`
--> $DIR/issue-98634.rs:24:21
|
LL | async fn callback() {}
| ^ checked the `Output` of this `async fn`, found opaque type
= note: expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
found opaque type `impl Future<Output = ()>`
note: required by a bound in `StructAsync`
--> $DIR/issue-98634.rs:9:35
|
LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`

error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
--> $DIR/issue-98634.rs:45:9
|
LL | StructAsync { callback }.await;
| ^^^^^^^^^^^^^^^^^^^^^^^^ expected struct `Pin`, found opaque type
|
note: while checking the return type of the `async fn`
--> $DIR/issue-98634.rs:24:21
|
LL | async fn callback() {}
| ^ checked the `Output` of this `async fn`, found opaque type
= note: expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
found opaque type `impl Future<Output = ()>`
note: required by a bound in `StructAsync`
--> $DIR/issue-98634.rs:9:35
|
LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`

error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
--> $DIR/issue-98634.rs:45:33
|
LL | StructAsync { callback }.await;
| ^^^^^^ expected struct `Pin`, found opaque type
|
note: while checking the return type of the `async fn`
--> $DIR/issue-98634.rs:24:21
|
LL | async fn callback() {}
| ^ checked the `Output` of this `async fn`, found opaque type
= note: expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
found opaque type `impl Future<Output = ()>`
note: required by a bound in `StructAsync`
--> $DIR/issue-98634.rs:9:35
|
LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0271`.

0 comments on commit 67c469f

Please sign in to comment.