Rust 1.82: what's new, what was stabilized

Language features stabilized

• Stabilize + use<'lt> opaque type precise capturing (RFC 3617)
• Stabilize &raw const and &raw mut operators (RFC 2582)
• Stabilize unsafe extern blocks (RFC 3484)
• Stabilize nested field access in offset_of!
• Stabilize const operands in inline assembly
• Stabilize floating-point arithmetic in const fn
• Stabilize explicit opt-in to unsafe attributes

76 APIs stabilized

std::thread::Builder::spawn_unchecked, std::str::CharIndices::offset, std::option::Option::is_none_or, [T]::is_sorted, [T]::is_sorted_by, [T]::is_sorted_by_key, Iterator::is_sorted, Iterator::is_sorted_by, Iterator::is_sorted_by_key, std::future::Ready::into_inner, std::iter::repeat_n, impl<T: Clone> DoubleEndedIterator for Take<Repeat<T>>, impl<T: Clone> ExactSizeIterator for Take<Repeat<T>>, impl<T: Clone> ExactSizeIterator for Take<RepeatWith<T>>, impl Default for std::collections::binary_heap::Iter, impl Default for std::collections::btree_map::RangeMut, impl Default for std::collections::btree_map::ValuesMut, impl Default for std::collections::vec_deque::Iter, impl Default for std::collections::vec_deque::IterMut, Rc<T>::new_uninit, Rc<MaybeUninit<T>>::assume_init, Rc<[T]>::new_uninit_slice, Rc<[MaybeUninit<T>]>::assume_init, Arc<T>::new_uninit, Arc<MaybeUninit<T>>::assume_init, Arc<[T]>::new_uninit_slice, Arc<[MaybeUninit<T>]>::assume_init, Box<T>::new_uninit, Box<MaybeUninit<T>>::assume_init, Box<[T]>::new_uninit_slice, Box<[MaybeUninit<T>]>::assume_init, core::arch::x86_64::_bextri_u64, core::arch::x86_64::_bextri_u32, core::arch::x86::_mm_broadcastsi128_si256, core::arch::x86::_mm256_stream_load_si256, core::arch::x86::_tzcnt_u16, core::arch::x86::_mm_extracti_si64, core::arch::x86::_mm_inserti_si64, core::arch::x86::_mm_storeu_si16, core::arch::x86::_mm_storeu_si32, core::arch::x86::_mm_storeu_si64, core::arch::x86::_mm_loadu_si16, core::arch::x86::_mm_loadu_si32, core::arch::wasm32::u8x16_relaxed_swizzle, core::arch::wasm32::i8x16_relaxed_swizzle, core::arch::wasm32::i32x4_relaxed_trunc_f32x4, core::arch::wasm32::u32x4_relaxed_trunc_f32x4, core::arch::wasm32::i32x4_relaxed_trunc_f64x2_zero, core::arch::wasm32::u32x4_relaxed_trunc_f64x2_zero, core::arch::wasm32::f32x4_relaxed_madd, core::arch::wasm32::f32x4_relaxed_nmadd, core::arch::wasm32::f64x2_relaxed_madd, core::arch::wasm32::f64x2_relaxed_nmadd, core::arch::wasm32::i8x16_relaxed_laneselect, core::arch::wasm32::u8x16_relaxed_laneselect, core::arch::wasm32::i16x8_relaxed_laneselect, core::arch::wasm32::u16x8_relaxed_laneselect, core::arch::wasm32::i32x4_relaxed_laneselect, core::arch::wasm32::u32x4_relaxed_laneselect, core::arch::wasm32::i64x2_relaxed_laneselect, core::arch::wasm32::u64x2_relaxed_laneselect, core::arch::wasm32::f32x4_relaxed_min, core::arch::wasm32::f32x4_relaxed_max, core::arch::wasm32::f64x2_relaxed_min, core::arch::wasm32::f64x2_relaxed_max, core::arch::wasm32::i16x8_relaxed_q15mulr, core::arch::wasm32::u16x8_relaxed_q15mulr, core::arch::wasm32::i16x8_relaxed_dot_i8x16_i7x16, core::arch::wasm32::u16x8_relaxed_dot_i8x16_i7x16, core::arch::wasm32::i32x4_relaxed_dot_i8x16_i7x16_add, core::arch::wasm32::u32x4_relaxed_dot_i8x16_i7x16_add, std::task::Waker::from_raw, std::task::Context::from_waker, std::task::Context::waker, {integer}::from_str_radix, std::num::ParseIntError::kind

Can it break my build?

The release lists these compatibility notes. Most only affect rare code, but read them before you raise your toolchain in CI:

Use it

rustup update stable        # get the newest release
rustup install 1.82          # or exactly this one
rustup override set 1.82     # pin a project to it

To require at least this version from users of your crate, set rust-version = "1.82" under [package] in Cargo.toml. Cargo then refuses to build it on older compilers with a clear message, and with resolver 3 (the default on the 2024 edition, Rust 1.85+) it also prefers dependency versions that support it.

Full release notes

Release notes from the Rust project's RELEASES.md (MIT or Apache-2.0); summaries above are ours.

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