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This PR contains the following updates: | Package | Update | Change | |---|---|---| | [STABLE](https://redirect.github.com/rust-lang/rust) | minor | `1.85` -> `1.86` | --- ### Release Notes <details> <summary>rust-lang/rust (STABLE)</summary> ### [`v1.86`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1860-2025-04-03) [Compare Source](https://redirect.github.com/rust-lang/rust/compare/1.85.0...1.86.0) \========================== <a id="1.86.0-Language"></a> ## Language - [Stabilize upcasting trait objects to supertraits.](https://redirect.github.com/rust-lang/rust/pull/134367) - [Allow safe functions to be marked with the `#[target_feature]` attribute.](https://redirect.github.com/rust-lang/rust/pull/134090) - [The `missing_abi` lint now warns-by-default.](https://redirect.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://redirect.github.com/rust-lang/rust/pull/126604) - [More pointers are now detected as definitely not-null based on their alignment in const eval.](https://redirect.github.com/rust-lang/rust/pull/133700) - [Empty `repr()` attribute applied to invalid items are now correctly rejected.](https://redirect.github.com/rust-lang/rust/pull/133925) - [Inner attributes `#![test]` and `#![rustfmt::skip]` are no longer accepted in more places than intended.](https://redirect.github.com/rust-lang/rust/pull/134276) <a id="1.86.0-Compiler"></a> ## Compiler - [Debug-assert that raw pointers are non-null on access.](https://redirect.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://redirect.github.com/rust-lang/rust/pull/135439) - [Fix emission of `overflowing_literals` under certain macro environments.](https://redirect.github.com/rust-lang/rust/pull/136393) <a id="1.86.0-Platform-Support"></a> ## Platform Support - [Replace `i686-unknown-redox` target with `i586-unknown-redox`.](https://redirect.github.com/rust-lang/rust/pull/136698) - [Increase baseline CPU of `i686-unknown-hurd-gnu` to Pentium 4.](https://redirect.github.com/rust-lang/rust/pull/136700) - New tier 3 targets: - [`{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock`](https://redirect.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://redirect.github.com/rust-lang/rust/pull/133631). For supporting Neutrino QNX 8.0 (`no_std`-only). - [`{x86_64,i686}-win7-windows-gnu`](https://redirect.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://redirect.github.com/rust-lang/rust/pull/134740). - [`x86_64-pc-cygwin`](https://redirect.github.com/rust-lang/rust/pull/134999). - [`{mips,mipsel}-mti-none-elf`](https://redirect.github.com/rust-lang/rust/pull/135074). Initial bare-metal support. - [`m68k-unknown-none-elf`](https://redirect.github.com/rust-lang/rust/pull/135085). - [`armv7a-nuttx-{eabi,eabihf}`, `aarch64-unknown-nuttx`, and `thumbv7a-nuttx-{eabi,eabihf}`](https://redirect.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. <a id="1.86.0-Libraries"></a> ## 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://redirect.github.com/rust-lang/rust/pull/134143), allowing users to examine why the conversion failed. - [Remove `RustcDecodable` and `RustcEncodable`.](https://redirect.github.com/rust-lang/rust/pull/134272) - [Deprecate libtest's `--logfile` option.](https://redirect.github.com/rust-lang/rust/pull/134283) - [On recent versions of Windows, `std::fs::remove_file` will now remove read-only files.](https://redirect.github.com/rust-lang/rust/pull/134679) <a id="1.86.0-Stabilized-APIs"></a> ## 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) - [`HashM...truncated (10000 bytes)