|
| 1 | +Version 1.86.0 (2025-04-03) |
| 2 | +========================== |
| 3 | + |
| 4 | +<a id="1.86.0-Language"></a> |
| 5 | + |
| 6 | +Language |
| 7 | +-------- |
| 8 | +- [Stabilize the ability to upcast a trait object to one of its supertraits.](https://github.com/rust-lang/rust/pull/134367) |
| 9 | +- [Allow safe functions to be marked with the `#[target_feature]` attribute.](https://github.com/rust-lang/rust/pull/134090) |
| 10 | +- [The `missing_abi` lint now warns-by-default.](https://github.com/rust-lang/rust/pull/132397) |
| 11 | +- 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) |
| 12 | +- [More pointers are now detected as definitely not-null based on their alignment in const eval.](https://github.com/rust-lang/rust/pull/133700) |
| 13 | +- [Empty `repr()` attribute applied to invalid items are now correctly rejected.](https://github.com/rust-lang/rust/pull/133925) |
| 14 | +- [Inner attributes `#![test]` and `#![rustfmt::skip]` are no longer accepted in more places than intended.](https://github.com/rust-lang/rust/pull/134276) |
| 15 | + |
| 16 | +<a id="1.86.0-Compiler"></a> |
| 17 | + |
| 18 | +Compiler |
| 19 | +-------- |
| 20 | +- [Debug-assert that raw pointers are non-null on access.](https://github.com/rust-lang/rust/pull/134424) |
| 21 | +- [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) |
| 22 | +- [Fix emission of `overflowing_literals` under certain macro environments.](https://github.com/rust-lang/rust/pull/136393) |
| 23 | + |
| 24 | +<a id="1.86.0-Platform-Support"></a> |
| 25 | + |
| 26 | +Platform Support |
| 27 | +---------------- |
| 28 | +- [Add new Tier 3 targets `{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock` for supporting Neutrino QNX 7.1 with `io-socket` network stack.](https://github.com/rust-lang/rust/pull/133631) |
| 29 | +- [Add new Tier 3 targets `{aarch64-unknown,x86_64-pc}-nto-qnx800` for supporting Neutrino QNX 8.0 `no_std` only.](https://github.com/rust-lang/rust/pull/133631) |
| 30 | +- [Add new Tier 3 targets `{x86_64,i686}-win7-windows-gnu`.](https://github.com/rust-lang/rust/pull/134609) |
| 31 | + These targets are 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. |
| 32 | +- [Add new Tier 3 target `amdgcn-amd-amdhsa`.](https://github.com/rust-lang/rust/pull/134740) |
| 33 | +- [Add new Tier 3 target `x86_64-pc-cygwin`.](https://github.com/rust-lang/rust/pull/134999) |
| 34 | +- [Add new Tier 3 targets `{mips,mipsel}-mti-none-elf` (initial bare-metal support).](https://github.com/rust-lang/rust/pull/135074) |
| 35 | +- [Add new Tier 3 target `m68k-unknown-none-elf`.](https://github.com/rust-lang/rust/pull/135085) |
| 36 | +- [Add new Tier 3 targets `armv7a-nuttx-{eabi,eabihf}`, `aarch64-unknown-nuttx`, and `thumbv7a-nuttx-{eabi,eabihf}`.](https://github.com/rust-lang/rust/pull/135757) |
| 37 | +- [Replace `i686-unknown-redox` target with `i586-unknown-redox`.](https://github.com/rust-lang/rust/pull/136698) |
| 38 | +- [Increase baseline CPU of `i686-unknown-hurd-gnu` to Pentium 4.](https://github.com/rust-lang/rust/pull/136700) |
| 39 | + |
| 40 | +Refer to Rust's [platform support page][platform-support-doc] |
| 41 | +for more information on Rust's tiered platform support. |
| 42 | + |
| 43 | +<a id="1.86.0-Libraries"></a> |
| 44 | + |
| 45 | +Libraries |
| 46 | +--------- |
| 47 | +- 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. |
| 48 | +- [Remove `RustcDecodable` and `RustcEncodable`.](https://github.com/rust-lang/rust/pull/134272) |
| 49 | +- [Deprecate libtest's `--logfile` option.](https://github.com/rust-lang/rust/pull/134283) |
| 50 | +- [On recent versions of Windows, `std::fs::remove_file` will now remove read-only files.](https://github.com/rust-lang/rust/pull/134679) |
| 51 | + |
| 52 | +<a id="1.86.0-Stabilized-APIs"></a> |
| 53 | + |
| 54 | +Stabilized APIs |
| 55 | +--------------- |
| 56 | + |
| 57 | +- [`{float}::next_down`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_down) |
| 58 | +- [`{float}::next_up`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_up) |
| 59 | +- [`<[_]>::get_disjoint_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_mut) |
| 60 | +- [`<[_]>::get_disjoint_unchecked_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_unchecked_mut) |
| 61 | +- [`slice::GetDisjointMutError`](https://doc.rust-lang.org/stable/std/slice/enum.GetDisjointMutError.html) |
| 62 | +- [`HashMap::get_disjoint_mut`](https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_mut) |
| 63 | +- [`HashMap::get_disjoint_unchecked_mut`](https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_unchecked_mut) |
| 64 | +- [`NonZero::count_ones`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.count_ones) |
| 65 | +- [`Vec::pop_if`](https://doc.rust-lang.org/std/vec/struct.Vec.html#method.pop_if) |
| 66 | +- [`sync::Once::wait`](https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait) |
| 67 | +- [`sync::Once::wait_force`](https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait_force) |
| 68 | +- [`sync::OnceLock::wait`](https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html#method.wait) |
| 69 | + |
| 70 | +These APIs are now stable in const contexts: |
| 71 | + |
| 72 | +- [`hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html) |
| 73 | +- [`io::Cursor::get_mut`](https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.get_mut) |
| 74 | +- [`io::Cursor::set_position`](https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.set_position) |
| 75 | +- [`str::is_char_boundary`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.is_char_boundary) |
| 76 | +- [`str::split_at`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at) |
| 77 | +- [`str::split_at_checked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_checked) |
| 78 | +- [`str::split_at_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut) |
| 79 | +- [`str::split_at_mut_checked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut_checked) |
| 80 | + |
| 81 | +<a id="1.86.0-Cargo"></a> |
| 82 | + |
| 83 | +Cargo |
| 84 | +----- |
| 85 | +- [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/) |
| 86 | +- [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. |
| 87 | +- [Deprecate the token argument in `cargo login` to avoid shell history leaks.](https://github.com/rust-lang/cargo/pull/15057/) |
| 88 | +- [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. |
| 89 | + |
| 90 | +<a id="1.86.0-Rustdoc"></a> |
| 91 | + |
| 92 | +Rustdoc |
| 93 | +----- |
| 94 | +- [Add a sans-serif font setting.](https://github.com/rust-lang/rust/pull/133636) |
| 95 | + |
| 96 | +<a id="1.86.0-Compatibility-Notes"></a> |
| 97 | + |
| 98 | +Compatibility Notes |
| 99 | +------------------- |
| 100 | +- [The `wasm_c_abi` future compatibility warning is now a hard error.](https://github.com/rust-lang/rust/pull/133951) |
| 101 | + Users of `wasm-bindgen` should upgrade to at least version 0.2.89, otherwise compilation will fail. |
| 102 | +- [Remove long-deprecated no-op attributes `#![no_start]` and `#![crate_id]`.](https://github.com/rust-lang/rust/pull/134300) |
| 103 | +- 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`. |
| 104 | +- [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) |
| 105 | + |
| 106 | +<a id="1.86.0-Internal-Changes"></a> |
| 107 | + |
| 108 | +Internal Changes |
| 109 | +---------------- |
| 110 | + |
| 111 | +These changes do not affect any public interfaces of Rust, but they represent |
| 112 | +significant improvements to the performance or internals of rustc and related |
| 113 | +tools. |
| 114 | + |
| 115 | +- [Build the rustc on AArch64 Linux with ThinLTO + PGO.](https://github.com/rust-lang/rust/pull/133807) |
| 116 | +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. |
| 117 | + |
| 118 | + |
1 | 119 | Version 1.85.1 (2025-03-18) |
2 | 120 | ========================== |
3 | 121 |
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