Use stable async-std channels from async 1.9; this fixes the build. Drop the 'unstable' feature.

Author: bgeron

.github/workflows/ci.yml

@@ -29,4 +29,3 @@ jobs:
       uses: actions-rs/cargo@v1
       with:
         command: test
-        args: --features unstable

Cargo.toml

@@ -10,7 +10,4 @@ description = "Experimental cooperative cancellation for async-std"
 
 [dependencies]
 pin-project-lite = "0.1.0"
-async-std = "1.0"
-
-[features]
-unstable = ["async-std/unstable"]
+async-std = "1.9"

src/lib.rs

@@ -5,15 +5,6 @@
 //! Experimental. The library works as is, breaking changes will bump major
 //! version, but there are no guarantees of long-term support.
 //!
-//! Additionally, this library uses unstable cargo feature feature of `async-std` and, for
-//! this reason, should be used like this:
-//!
-//! ```toml
-//! [dependencies.stop-token]
-//! version = "0.1.0"
-//! features = [ "unstable" ]
-//! ```
-//!
 //! # Motivation
 //!
 //! Rust futures come with a build-in cancellation mechanism: dropping a future