diff --git a/RELEASES.md b/RELEASES.md index 81310c20c5ef9..940fa7c6072a9 100644 --- a/RELEASES.md +++ b/RELEASES.md @@ -1,3 +1,100 @@ +Version 1.98.0 (2026-08-20) +========================== + + + +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) + + + + +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 + + + +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. + + + + +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::from_mut`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut) +- [`Atomic::get_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.get_mut_slice) +- [`Atomic::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) + + + + +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) ==========================