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add relnotes 1.98.0 #161293

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add relnotes 1.98.0
BoxyUwU Aug 18, 2026
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cuviper Aug 19, 2026
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97 changes: 97 additions & 0 deletions RELEASES.md
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Version 1.98.0 (2026-08-20)
==========================

<a id="1.98.0-Language"></a>

Language
--------
- [Allow shortening lifetime of `&mut` when unsize-coercing, even in an invariant position.](https://github.com/rust-lang/rust/pull/149219) For example, you can now coerce a `Cell<&'long mut i32>` to a `Cell<&'short mut dyn Send>`. Such shortenings were already previously allowed when coercing a `&mut` to a `&`, or coercing a `&` to a `&`.
- [Add deny-by-default `invalid_runtime_symbol_definitions` lint and warn-by-default `suspicious_runtime_symbol_definitions` lint](https://github.com/rust-lang/rust/pull/155521)
- The lints currently specifically targets `core` runtime symbols like `memcmp`, `memset`, `strlen`, ... and is planned to be expanded in the next few releases.
- [Add warn-by-default `c_void_returns` lint to check `core::ffi::c_void` as a return type](https://github.com/rust-lang/rust/pull/156379)


<a id="1.98.0-Platform-Support"></a>

Platform Support
----------------
- [Add `powerpc64-unknown-linux-gnuelfv2` as Tier 3](https://github.com/rust-lang/rust/pull/144220)
- [Add `aarch64-unknown-linux-pauthtest` as Tier 3 target](https://github.com/rust-lang/rust/pull/155722)
- [Promote `thumbv7a-none-eabi` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
- [Promote `thumbv7a-none-eabihf` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
- [Promote `thumbv7r-none-eabi` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
- [Promote `thumbv7r-none-eabihf` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
- [Promote `thumbv8r-none-eabihf` to Tier 2](https://github.com/rust-lang/rust/pull/155763)


Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html

<a id="1.98.0-Libraries"></a>

Libraries
---------
- [Change `Location<'_>` lifetime to `'static` in `Panic[Hook]Info`](https://github.com/rust-lang/rust/pull/146561)
- [Document panic in `RangeInclusive::from(legacy::RangeInclusive)`](https://github.com/rust-lang/rust/pull/155421)
- [Document that `ManuallyDrop`'s `Box` interaction has been fixed](https://github.com/rust-lang/rust/pull/155750)
- [Stabilize LoongArch CRC Intrinsics](https://github.com/rust-lang/rust/issues/156908)
- [The `derive` macro is available at `{core,std}::derive`.](https://github.com/rust-lang/rust/issues/154645) This was previously [unintentionally stabilized in 1.96](https://github.com/rust-lang/rust/issues/159856), but is now [explicitly accepted](https://github.com/rust-lang/rust/issues/154645) as a stabilized API.
- Please note that the MSRV for `{core,std}::derive` will be 1.96, and not 1.98.


<a id="1.98.0-Stabilized-APIs"></a>

Stabilized APIs
---------------

- [`str::substr_range`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.substr_range)
- [`[T]::subslice_range`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.subslice_range)
- [`core::fmt::NumBuffer`](https://doc.rust-lang.org/stable/core/fmt/struct.NumBuffer.html)
- [`<{integer}>::format_into`](https://doc.rust-lang.org/stable/core/primitive.usize.html#method.format_into)
- [`Send/Sync for std::process::CommandArgs`](https://doc.rust-lang.org/stable/std/process/struct.CommandArgs.html#impl-Send-for-CommandArgs%3C'a%3E)
- [`{fN}::algebraic_add`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_add)
- [`{fN}::algebraic_sub`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_sub)
- [`{fN}::algebraic_mul`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_mul)
- [`{fN}::algebraic_div`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_div)
- [`{fN}::algebraic_rem`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_rem)
- [`NonZero<{integer}>::from_str_radix`](https://doc.rust-lang.org/stable/core/num/struct.NonZero.html#method.from_str_radix-4)
- [`String::from_utf16le`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le)
- [`String::from_utf16le_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le_lossy)
- [`String::from_utf16be`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be)
- [`String::from_utf16be_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be_lossy)
- [`[T]::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.strip_circumfix)
- [`str::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.str.html#method.strip_circumfix)
- [`Atomic<T>::from_mut`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut)
- [`Atomic<T>::get_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.get_mut_slice)
- [`Atomic<T>::from_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut_slice)
- [`std::range::legacy`](https://doc.rust-lang.org/stable/std/range/legacy/index.html)


<a id="1.98.0-Compatibility-Notes"></a>

Compatibility Notes
-------------------
- [If fully elided, lifetime bounds of trait object types may now resolve differently or even get rejected in very specific niche scenarios](https://github.com/rust-lang/rust/pull/129543)
- [Error in more cases of ambiguous imports](https://github.com/rust-lang/rust/pull/145108)
- [Switch the destructors implementation for thread locals on Windows to use Fiber Local Storage (FLS)](https://github.com/rust-lang/rust/pull/148799)
- [Convert some cases of the `ambiguous_glob_imports` lint into a hard error](https://github.com/rust-lang/rust/pull/149195)
- [Where-bounds of the form `Type = Type` and `Type == Type` are no longer syntactically allowed](https://github.com/rust-lang/rust/pull/153513)
- [Ensure Send/Sync is not implemented for std::env::Vars{,Os}](https://github.com/rust-lang/rust/pull/155153)
- [Fix that in some attributes, arguments were not properly rejected](https://github.com/rust-lang/rust/pull/155193)
- [`repr(transparent)` is now more strict about which fields have "trivial" layout and hence can be ignored: `repr(C)` types, types with private fields, and `#[non_exhaustive]` types are no longer considered "trivial"](https://github.com/rust-lang/rust/pull/155299)
- [Correctly check whether types have equal size in `transmute()` when some `repr` attributes are involved.](https://github.com/rust-lang/rust/pull/155418)
- [More characters are escaped when printing strings and chars](https://github.com/rust-lang/rust/pull/155527)
- [Implement fast path for `derive(PartialOrd)` when deriving `Ord`](https://github.com/rust-lang/rust/pull/155598)
This can break crates in practice where a type's PartialOrd and Ord impls were inconsistent with each other.
- [Add temporary scope to `assert_eq` and `assert_ne`](https://github.com/rust-lang/rust/pull/155739)
- Closed a hole in the pattern matching [structural equality](https://doc.rust-lang.org/reference/patterns.html#constant-patterns) check, preventing cases where a match of a constant would be allowed, despite disagreeing with a manually written `PartialEq` implementation, when a `derive(PartialEq)` implementation for that type also exists.
- [On Emscripten the WASM exception handling ABI is now unconditionally used](https://github.com/rust-lang/rust/pull/156928) The `-Zemscripten-wasm-eh=false` flag to switch back to JS exceptions has been removed.
- [The UNSAFE_CODE lint is now consistently emitted for all unsafe attributes](https://github.com/rust-lang/rust/pull/157201)
- [Solaris: remove `File::lock` implementation, it has the wrong semantics (return "unsupported" instead)](https://github.com/rust-lang/rust/pull/157509)
- [Windows-gnu targets now specify baseline tools versions](https://github.com/rust-lang/rust/pull/158020)
- [rustfmt now discovers module files that are defined in `cfg_select!`](https://github.com/rust-lang/rust/pull/158372)
This may cause more code to be formatted which was previously ignored.


Version 1.97.1 (2026-07-16)
==========================

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