rust/tests/ui/async-await/issue-63832-await-short-temporary-lifetime.rs

// check-pass
// edition:2018

async fn foo(x: &[Vec<u32>]) -> u32 {
    0
}

async fn bar() {
    foo(&[vec![123]]).await;
}

fn main() { }
lowering: extend temporary lifetimes around await This commit changes the HIR lowering around `await` so that temporary lifetimes are extended. Previously, await was lowered as: ```rust { let mut pinned = future; loop { match ::std::future::poll_with_tls_context(unsafe { <::std::pin::Pin>::new_unchecked(&mut pinned) }) { ::std::task::Poll::Ready(result) => break result, ::std::task::Poll::Pending => {} } yield (); } } ``` With this commit, await is lowered as: ```rust match future { mut pinned => loop { match ::std::future::poll_with_tls_context(unsafe { <::std::pin::Pin>::new_unchecked(&mut pinned) }) { ::std::task::Poll::Ready(result) => break result, ::std::task::Poll::Pending => {} } yield (); } } ``` However, this change has the following side-effects: - All temporaries in future will be considered to live across a yield for the purpose of auto-traits. - Borrowed temporaries in future are likely to be considered to be live across the yield for the purpose of the generator transform. Signed-off-by: David Wood <david@davidtw.co> 2019-09-08 20:22:51 +00:00			`// check-pass`
			`// edition:2018`

			`async fn foo(x: &[Vec<u32>]) -> u32 {`
			`0`
			`}`

			`async fn bar() {`
			`foo(&[vec![123]]).await;`
			`}`

			`fn main() { }`