From af7359ee4fd25ac5fd92fa20c8b37405ac0d0c05 Mon Sep 17 00:00:00 2001 From: Josh Stone Date: Wed, 26 Mar 2025 12:10:47 -0700 Subject: [PATCH] Add release notes for 1.86.0 --- RELEASES.md | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) diff --git a/RELEASES.md b/RELEASES.md index 755e73a34c6..3047a0c366a 100644 --- a/RELEASES.md +++ b/RELEASES.md @@ -1,3 +1,125 @@ +Version 1.86.0 (2025-04-03) +========================== + + + +Language +-------- +- [Stabilize the ability to upcast a trait object to one of its supertraits.](https://github.com/rust-lang/rust/pull/134367) +- [Allow safe functions to be marked with the `#[target_feature]` attribute.](https://github.com/rust-lang/rust/pull/134090) +- [The `missing_abi` lint now warns-by-default.](https://github.com/rust-lang/rust/pull/132397) +- Rust now lints about double negations, to catch cases that might have intended to be a prefix decrement operator (`--x`) as written in other languages. This was previously a clippy lint, `clippy::double_neg`, and is [now available directly in Rust as `double_negations`.](https://github.com/rust-lang/rust/pull/126604) +- [More pointers are now detected as definitely not-null based on their alignment in const eval.](https://github.com/rust-lang/rust/pull/133700) +- [Empty `repr()` attribute applied to invalid items are now correctly rejected.](https://github.com/rust-lang/rust/pull/133925) +- [Inner attributes `#![test]` and `#![rustfmt::skip]` are no longer accepted in more places than intended.](https://github.com/rust-lang/rust/pull/134276) + + + +Compiler +-------- +- [Debug-assert that raw pointers are non-null on access.](https://github.com/rust-lang/rust/pull/134424) +- [Change `-O` to mean `-C opt-level=3` instead of `-C opt-level=2` to match Cargo's defaults.](https://github.com/rust-lang/rust/pull/135439) +- [Fix emission of `overflowing_literals` under certain macro environments.](https://github.com/rust-lang/rust/pull/136393) + + + +Platform Support +---------------- +- [Replace `i686-unknown-redox` target with `i586-unknown-redox`.](https://github.com/rust-lang/rust/pull/136698) +- [Increase baseline CPU of `i686-unknown-hurd-gnu` to Pentium 4.](https://github.com/rust-lang/rust/pull/136700) +- New tier 3 targets: + - [`{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock`](https://github.com/rust-lang/rust/pull/133631). + For supporting Neutrino QNX 7.1 with `io-socket` network stack. + - [`{aarch64-unknown,x86_64-pc}-nto-qnx800`](https://github.com/rust-lang/rust/pull/133631). + For supporting Neutrino QNX 8.0 (`no_std`-only). + - [`{x86_64,i686}-win7-windows-gnu`](https://github.com/rust-lang/rust/pull/134609). + Intended for backwards compatibility with Windows 7. `{x86_64,i686}-win7-windows-msvc` are the Windows MSVC counterparts that already exist as Tier 3 targets. + - [`amdgcn-amd-amdhsa`](https://github.com/rust-lang/rust/pull/134740). + - [`x86_64-pc-cygwin`](https://github.com/rust-lang/rust/pull/134999). + - [`{mips,mipsel}-mti-none-elf`](https://github.com/rust-lang/rust/pull/135074). + Initial bare-metal support. + - [`m68k-unknown-none-elf`](https://github.com/rust-lang/rust/pull/135085). + - [`armv7a-nuttx-{eabi,eabihf}`, `aarch64-unknown-nuttx`, and `thumbv7a-nuttx-{eabi,eabihf}`](https://github.com/rust-lang/rust/pull/135757). + +Refer to Rust's [platform support page][platform-support-doc] +for more information on Rust's tiered platform support. + + + +Libraries +--------- +- The type of `FromBytesWithNulError` in `CStr::from_bytes_with_nul(bytes: &[u8]) -> Result<&Self, FromBytesWithNulError>` was [changed from an opaque struct to an enum](https://github.com/rust-lang/rust/pull/134143), allowing users to examine why the conversion failed. +- [Remove `RustcDecodable` and `RustcEncodable`.](https://github.com/rust-lang/rust/pull/134272) +- [Deprecate libtest's `--logfile` option.](https://github.com/rust-lang/rust/pull/134283) +- [On recent versions of Windows, `std::fs::remove_file` will now remove read-only files.](https://github.com/rust-lang/rust/pull/134679) + + + +Stabilized APIs +--------------- + +- [`{float}::next_down`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_down) +- [`{float}::next_up`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_up) +- [`<[_]>::get_disjoint_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_mut) +- [`<[_]>::get_disjoint_unchecked_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_unchecked_mut) +- [`slice::GetDisjointMutError`](https://doc.rust-lang.org/stable/std/slice/enum.GetDisjointMutError.html) +- [`HashMap::get_disjoint_mut`](https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_mut) +- [`HashMap::get_disjoint_unchecked_mut`](https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_unchecked_mut) +- [`NonZero::count_ones`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.count_ones) +- [`Vec::pop_if`](https://doc.rust-lang.org/std/vec/struct.Vec.html#method.pop_if) +- [`sync::Once::wait`](https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait) +- [`sync::Once::wait_force`](https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait_force) +- [`sync::OnceLock::wait`](https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html#method.wait) + +These APIs are now stable in const contexts: + +- [`hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html) +- [`io::Cursor::get_mut`](https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.get_mut) +- [`io::Cursor::set_position`](https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.set_position) +- [`str::is_char_boundary`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.is_char_boundary) +- [`str::split_at`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at) +- [`str::split_at_checked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_checked) +- [`str::split_at_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut) +- [`str::split_at_mut_checked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut_checked) + + + +Cargo +----- +- [When merging, replace rather than combine configuration keys that refer to a program path and its arguments.](https://github.com/rust-lang/cargo/pull/15066/) +- [Error if both `--package` and `--workspace` are passed but the requested package is missing.](https://github.com/rust-lang/cargo/pull/15071/) This was previously silently ignored, which was considered a bug since missing packages should be reported. +- [Deprecate the token argument in `cargo login` to avoid shell history leaks.](https://github.com/rust-lang/cargo/pull/15057/) +- [Simplify the implementation of `SourceID` comparisons.](https://github.com/rust-lang/cargo/pull/14980/) This may potentially change behavior if the canonicalized URL compares differently in alternative registries. + + + +Rustdoc +----- +- [Add a sans-serif font setting.](https://github.com/rust-lang/rust/pull/133636) + + + +Compatibility Notes +------------------- +- [The `wasm_c_abi` future compatibility warning is now a hard error.](https://github.com/rust-lang/rust/pull/133951) + Users of `wasm-bindgen` should upgrade to at least version 0.2.89, otherwise compilation will fail. +- [Remove long-deprecated no-op attributes `#![no_start]` and `#![crate_id]`.](https://github.com/rust-lang/rust/pull/134300) +- The future incompatibility lint `cenum_impl_drop_cast` [has been made into a hard error.](https://github.com/rust-lang/rust/pull/135964) This means it is now an error to cast a field-less enum to an integer if the enum implements `Drop`. +- [SSE2 is now required for "i686" 32-bit x86 hard-float targets; disabling it causes a warning that will become a hard error eventually.](https://github.com/rust-lang/rust/pull/137037) + + + +Internal Changes +---------------- + +These changes do not affect any public interfaces of Rust, but they represent +significant improvements to the performance or internals of rustc and related +tools. + +- [Build the rustc on AArch64 Linux with ThinLTO + PGO.](https://github.com/rust-lang/rust/pull/133807) +The ARM 64-bit compiler (AArch64) on Linux is now optimized with ThinLTO and PGO, similar to the optimizations we have already performed for the x86-64 compiler on Linux. This should make it up to 30% faster. + + Version 1.85.1 (2025-03-18) ==========================