What's in 1.75.0 stable async fn and return-position impl Trait in traits As announced last week, Rust 1.75 supports use of async fn and -> impl Trait in traits. However, this initial release comes with some limitations that are described in the announcement post. It's expected that these limitations will be lifted in future releases. Pointer byte offset APIs Raw pointers (const T and *mut T) used to primarily support operations operating in units of T. For example, <const T>::add(1) would add size_of::<T>() bytes to the pointer's address. In some cases, working with byte offsets is more convenient, and these new APIs avoid requiring callers to cast to const u8/mut u8 first. pointer::byte_add pointer::byte_offset pointer::byte_offset_from pointer::byte_sub pointer::wrapping_byte_add pointer::wrapping_byte_offset pointer::wrapping_byte_sub Code layout optimizations for rustc The Rust compiler continues to get faster, with this release including the application of BOLT to our binary releases, bringing a 2% mean wall time improvements on our benchmarks. This tool optimizes the layout of the librustc_driver.so library containing most of the rustc code, allowing for better cache utilization. We are also now building rustc with -Ccodegen-units=1, which provides more opportunity for optimizations in LLVM. This optimization brought a separate 1.5% wall time mean win to our benchmarks. In this release these optimizations are limited to x86_64-unknown-linux-gnu compilers, but we expect to expand that over time to include more platforms. Stabilized APIs Atomic*::from_ptr FileTimes FileTimesExt File::set_modified File::set_times IpAddr::to_canonical Ipv6Addr::to_canonical Option::as_slice Option::as_mut_slice pointer::byte_add pointer::byte_offset pointer::byte_offset_from pointer::byte_sub pointer::wrapping_byte_add pointer::wrapping_byte_offset pointer::wrapping_byte_sub These APIs are now stable in const contexts: Ipv6Addr::to_ipv4_mapped MaybeUninit::assume_init_read MaybeUninit::zeroed mem::discriminant mem::zeroed