Software-update: Rust 1.95.0

Rust is een programmeertaal bedacht door Graydon Hoare en oorspronkelijk ontwikkeld door Mozilla. Het is deels geïnspireerd op de programmeertaal C, maar kent syntactische en semantische verschillen. Het focust op veiligheid en moet moderne computersystemen efficiënter benutten. Het wordt onder meer ingezet door Cloudflare, OVH, Mozilla, Deliveroo, Coursera, AppSignal en Threema. Versie 1.95 is uitgebracht en de releasenotes voor die uitgave kunnen hieronder worden gevonden.

cfg_select!

Rust 1.95 introduces a cfg_select! macro that acts roughly similar to a compile-time match on cfgs. This fulfills the same purpose as the popular cfg-if crate, although with a different syntax. cfg_select! expands to the right-hand side of the first arm whose configuration predicate evaluates to true. Some examples:

if-let guards in matches

Rust 1.88 stabilized let chains. Rust 1.95 brings that capability into match expressions, allowing for conditionals based on pattern matching.

Note that the compiler will not currently consider the patterns matched in if let guards as part of the exhaustiveness evaluation of the overall match, just like if guards.

Stabilized APIs

MaybeUninit<[T; N]>: From<[MaybeUninit<T>; N]>MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>; N]>MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>]>MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>; N]>MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>]>[MaybeUninit<T>; N]: From<MaybeUninit<[T; N]>>Cell<[T; N]>: AsRef<[Cell<T>; N]>Cell<[T; N]>: AsRef<[Cell<T>]>Cell<[T]>: AsRef<[Cell<T>]>bool: TryFrom<{integer}>AtomicPtr::updateAtomicPtr::try_updateAtomicBool::updateAtomicBool::try_updateAtomicIn::updateAtomicIn::try_updateAtomicUn::updateAtomicUn::try_updatecfg_select!mod core::rangecore::range::RangeInclusivecore::range::RangeInclusiveItercore::hint::cold_path<*const T>::as_ref_unchecked<*mut T>::as_ref_unchecked<*mut T>::as_mut_uncheckedVec::push_mutVec::insert_mutVecDeque::push_front_mutVecDeque::push_back_mutVecDeque::insert_mutLinkedList::push_front_mutLinkedList::push_back_mutLayout::dangling_ptrLayout::repeatLayout::repeat_packedLayout::extend_packed

MaybeUninit<[T; N]>: From<[MaybeUninit<T>; N]>

MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>; N]>

MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>]>

MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>; N]>

MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>]>

[MaybeUninit<T>; N]: From<MaybeUninit<[T; N]>>

Cell<[T; N]>: AsRef<[Cell<T>; N]>

Cell<[T; N]>: AsRef<[Cell<T>]>

Cell<[T]>: AsRef<[Cell<T>]>

bool: TryFrom<{integer}>

AtomicPtr::update

AtomicPtr::try_update

AtomicBool::update

AtomicBool::try_update

AtomicIn::update

AtomicIn::try_update

AtomicUn::update

AtomicUn::try_update

cfg_select!

mod core::range

core::range::RangeInclusive

core::range::RangeInclusiveIter

core::hint::cold_path

<*const T>::as_ref_unchecked

<*mut T>::as_ref_unchecked

<*mut T>::as_mut_unchecked

Vec::push_mut

Vec::insert_mut

VecDeque::push_front_mut

VecDeque::push_back_mut

VecDeque::insert_mut

LinkedList::push_front_mut

LinkedList::push_back_mut

Layout::dangling_ptr

Layout::repeat

Layout::repeat_packed

Layout::extend_packed

These previously stable APIs are now stable in const contexts:

fmt::from_fnControlFlow::is_breakControlFlow::is_continue

fmt::from_fn

ControlFlow::is_break

ControlFlow::is_continue

Destabilized JSON target specs

Rust 1.95 removes support on stable for passing a custom target specification to rustc. This should not affect any Rust users using a fully stable toolchain, as building the standard library (including just core) already required using nightly-only features.

not

We're also gathering use cases for custom targets on the tracking issue as we consider whether some form of this feature should eventually be stabilized.

Other changes

Check out everything that changed in Rust, Cargo, and Clippy.

Source: Tweakers.net