rust/tests/ui/impl-trait/async_scope_creep.rs

38 lines
803 B
Rust

#![feature(type_alias_impl_trait)]
// edition:2021
//[rpit] check-pass
// revisions: tait rpit
struct Pending {}
struct CantOpen {}
trait AsyncRead {}
impl AsyncRead for i32 {}
type PendingReader<'a> = impl AsyncRead + 'a;
#[cfg(tait)]
type OpeningReadFuture<'a> = impl std::future::Future<Output = Result<PendingReader<'a>, CantOpen>>;
impl Pending {
async fn read(&mut self) -> Result<impl AsyncRead + '_, CantOpen> {
Ok(42)
}
#[cfg(tait)]
fn read_fut(&mut self) -> OpeningReadFuture<'_> {
self.read() //[tait]~ ERROR: cannot satisfy `impl AsyncRead + 'a == PendingReader<'a>`
}
#[cfg(rpit)]
fn read_fut(
&mut self,
) -> impl std::future::Future<Output = Result<PendingReader<'_>, CantOpen>> {
self.read()
}
}
fn main() {}