Tighten language about ready! and poll_fn and move to stabilizations

Author: joshtriplett

posts/2022-09-22-Rust-1.64.0.md

@@ -140,23 +140,6 @@ working with C strings. Rust 1.64 also provides
 for working with owned C strings using only the `alloc` crate, rather than the
 full `std` library.
 
-### Stabilizing `ready!` and `poll_fn`
-
-When working with the low-level details of futures, you'll currently often
-encounter the [`Poll`](https://doc.rust-lang.org/std/task/enum.Poll.html) type.
-We've stabilized a few helpers for working with this type:
-
-- [`ready!`](https://doc.rust-lang.org/std/task/macro.ready.html) takes a
-  `Poll` and returns from the containing function for `Poll::Pending`, or
-  returns the contained value in a `Poll::Ready`. This can be useful when
-  implementing futures manually using `Poll`.
-- [`poll_fn`](https://doc.rust-lang.org/std/future/fn.poll_fn.html) turns a
-  function returning `Poll` into a future.
-
-In the future, we hope to provide simpler APIs that require less use of
-low-level details like `Poll` and `Pin`, but in the meantime, these helpers
-make it easier to write such code.
-
 ### rust-analyzer is now available via rustup
 
 [rust-analyzer](https://rust-analyzer.github.io/) is now included as part of
@@ -212,8 +195,6 @@ targets by default.
 The following methods and trait implementations are now stabilized:
 
 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
-- [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
-- [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
@@ -258,6 +239,16 @@ available in `core::ffi` and `std::ffi`:
 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
 
+We've stabilized some helpers for use with `Poll`, the low-level implementation
+underneath futures:
+
+- [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
+- [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
+
+In the future, we hope to provide simpler APIs that require less use of
+low-level details like `Poll` and `Pin`, but in the meantime, these helpers
+make it easier to write such code.
+
 These APIs are now usable in const contexts:
 
 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)