async-std Files

Happy New Year everyone! This patch stabilizes the async_std::channel submodule, removes the deprecated sync::channel types, and introduces the tokio1 feature.

New Channels

As part of our 1.8.0 release last month we introduced the new async_std::channel submodule and deprecated the unstable async_std::sync::channel types. You can read our full motiviation for this change in the last patch notes. But the short version is that the old channels had some fundamental problems, and the sync submodule is a bit of a mess.

This release of async-std promotes async_std::channel to stable, and fully removes the async_std::sync::channel types. In practice many libraries have already been upgraded to the new channels in the past month, and this will enable much of the ecosystem to switch off "unstable" versions of async-std.

:::rust
use async_std::channel;

let (sender, receiver) = channel::unbounded();

assert_eq!(sender.send("Hello").await, Ok(()));
assert_eq!(receiver.recv().await, Ok("Hello"));

Tokio 1.0 compat

The Tokio project recently released version 1.0 of their runtime, and the async-std team would like to congratulate the Tokio team on achieving this milestone.

This release of async-std adds the tokio1 feature flag, enabling Tokio's TLS constructors to be initialized within the async-std runtime. This is in addition to the tokio02 and tokio03 feature flags which we were already exposing.

In terms of stability it's worth noting that we will continue to provide support for the tokio02, tokio03, and tokio1 on the current major release line of async-std. These flags are part of our public API, and removing compat support for older Tokio versions is considered a breaking change.

Added

• Added the tokio1 feature (#924)
• Stabilized the async_std::channel submodule (#934)

Removed

• Removed deprecated sync::channel (#933)

Fixed

• Fixed a typo for [sic] FuturesExt trait (#930)
• Update the link to cargo-edit in the installation section of the docs (#932)
• Fixed a small typo for stream (#926)

Internal

• Updated rand to 0.8 (#923)
• Migrated RwLock and Barrier to use the async-lock crate internally (#925)
• Replaced uses of deprecated the compare_and_swap method with compare_exchange (#927)