information on Rust's tiered platform support.
- [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
- [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
-- [Fix repr(align) enum handling](https://github.com/rust-lang/rust/pull/96814/)
- [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
Libraries
---------
- [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
- You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
-- [Enforce that layout size fits in isize in Layout](https://github.com/rust-lang/rust/pull/95295/)
- [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
- [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
- [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
Stabilized APIs
---------------
-- [`ffi::CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html)
-- [`ffi::CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html)
-- [`ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesWithNulError.html)
-- [`ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromVecWithNulError.html)
-- [`ffi::IntoStringError`](https://doc.rust-lang.org/stable/std/ffi/struct.IntoStringError.html)
-- [`ffi::NulError`](https://doc.rust-lang.org/stable/std/ffi/struct.NulError.html)
-- [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
-- [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
-- [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
-- [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
-- [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
-- [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
-- [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
-- [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
-- [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
-- [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
-- [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
-- [`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)
- [`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)
- [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
- [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
+These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
+
+- [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
+- [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
+- [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
+- [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
+- [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
+- [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
+
+These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
+
+- [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
+- [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
+- [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
+- [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
+- [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
+- [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
+- [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
+- [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
+- [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
+- [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
+- [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
+- [`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)
+
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)
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