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Rust 1.98.0

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5 breaking changes5 punti chiave

Rust 1.98 adds many stabilized APIs and lints, but several compatibility changes need checking before upgrading.

sintesi · solo dalle note di rilascio · claude-haiku-5-5 · prompt v7

breaking changestutte citate, ognuna con una soluzione

breaking[2]: More ambiguous imports are now a hard error.

release-notes:68
Error in more cases of ambiguous imports

help: Check for ambiguous imports and resolve them, for example by importing the specific item you need. The notes give no further migration steps.

breaking[4]: Deriving Ord now uses a fast path from derive(PartialOrd), which can break types whose PartialOrd and Ord impls disagree.

release-notes:77
Implement fast path for derive(PartialOrd) when deriving Ord This can break crates in practice where a type's PartialOrd and Ord impls were inconsistent with each other.

help: Check types that implement PartialOrd and Ord by hand and make sure both impls give the same results.

breaking[5]: The -Zemscripten-wasm-eh=false flag has been removed, and Emscripten always uses the WASM exception handling ABI.

release-notes:80
On Emscripten the WASM exception handling ABI is now unconditionally used The -Zemscripten-wasm-eh=false flag to switch back to JS exceptions has been removed.

help: Remove any use of the -Zemscripten-wasm-eh=false flag from your build configuration.

punti chiave

release-notesgithub.com/rust-lang/rust · 84 righe
  1. <a id="1.98.0-Language"></a>
  3. ## Language
  5. - [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 `&`.
  6. - [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)
  7. - The lints currently specifically targets `core` runtime symbols like `memcmp`, `memset`, `strlen`, ... and is planned to be expanded in the next few releases.
  8. - [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)
  10. <a id="1.98.0-Platform-Support"></a>
  12. ## Platform Support
  14. - [Add `powerpc64-unknown-linux-gnuelfv2` as Tier 3](https://github.com/rust-lang/rust/pull/144220)
  15. - [Add `aarch64-unknown-linux-pauthtest` as Tier 3 target](https://github.com/rust-lang/rust/pull/155722)
  16. - [Promote `thumbv7a-none-eabi` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
  17. - [Promote `thumbv7a-none-eabihf` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
  18. - [Promote `thumbv7r-none-eabi` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
  19. - [Promote `thumbv7r-none-eabihf` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
  20. - [Promote `thumbv8r-none-eabihf` to Tier 2](https://github.com/rust-lang/rust/pull/155763)
  22. Refer to Rust's [platform support page](https://doc.rust-lang.org/rustc/platform-support.html) for more information on Rust's tiered platform support.
  24. <a id="1.98.0-Libraries"></a>
  26. ## Libraries
  28. - [Change `Location<'_>` lifetime to `'static` in `Panic[Hook]Info`](https://github.com/rust-lang/rust/pull/146561)
  29. - [Document panic in `RangeInclusive::from(legacy::RangeInclusive)`](https://github.com/rust-lang/rust/pull/155421)
  30. - [Document that `ManuallyDrop`'s `Box` interaction has been fixed](https://github.com/rust-lang/rust/pull/155750)
  31. - [Stabilize LoongArch CRC Intrinsics](https://github.com/rust-lang/rust/issues/156908)
  32. - [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.
  33. - Please note that the MSRV for `{core,std}::derive` will be 1.96, and not 1.98.
  35. <a id="1.98.0-Stabilized-APIs"></a>
  37. ## Stabilized APIs
  39. - [`str::substr_range`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.substr_range)
  40. - [`[T]::subslice_range`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.subslice_range)
  41. - [`core::fmt::NumBuffer`](https://doc.rust-lang.org/stable/core/fmt/struct.NumBuffer.html)
  42. - [`<{integer}>::format_into`](https://doc.rust-lang.org/stable/core/primitive.usize.html#method.format_into)
  43. - [`Send/Sync for std::process::CommandArgs`](https://doc.rust-lang.org/stable/std/process/struct.CommandArgs.html#impl-Send-for-CommandArgs%3C'a%3E)
  44. - [`{fN}::algebraic_add`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_add)
  45. - [`{fN}::algebraic_sub`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_sub)
  46. - [`{fN}::algebraic_mul`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_mul)
  47. - [`{fN}::algebraic_div`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_div)
  48. - [`{fN}::algebraic_rem`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_rem)
  49. - [`NonZero<{integer}>::from_str_radix`](https://doc.rust-lang.org/stable/core/num/struct.NonZero.html#method.from_str_radix-4)
  50. - [`String::from_utf16le`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le)
  51. - [`String::from_utf16le_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le_lossy)
  52. - [`String::from_utf16be`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be)
  53. - [`String::from_utf16be_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be_lossy)
  54. - [`[T]::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.strip_circumfix)
  55. - [`str::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.str.html#method.strip_circumfix)
  56. - [`Atomic<T>::from_mut`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut)
  57. - [`Atomic<T>::get_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.get_mut_slice)
  58. - [`Atomic<T>::from_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut_slice)
  59. - [`std::range::legacy`](https://doc.rust-lang.org/stable/std/range/legacy/index.html)
  60. - [`bool::ok_or`](https://doc.rust-lang.org/stable/std/primitive.bool.html#method.ok_or)
  61. - [`bool::ok_or_else`](https://doc.rust-lang.org/stable/std/primitive.bool.html#method.ok_or_else)
  63. <a id="1.98.0-Compatibility-Notes"></a>
  65. ## Compatibility Notes
  67. - [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)
  68. - [Error in more cases of ambiguous imports](https://github.com/rust-lang/rust/pull/145108)
  69. - [Switch the destructors implementation for thread locals on Windows to use Fiber Local Storage (FLS)](https://github.com/rust-lang/rust/pull/148799)
  70. - [Convert some cases of the `ambiguous_glob_imports` lint into a hard error](https://github.com/rust-lang/rust/pull/149195)
  71. - [Where-bounds of the form `Type = Type` and `Type == Type` are no longer syntactically allowed](https://github.com/rust-lang/rust/pull/153513)
  72. - [Ensure Send/Sync is not implemented for std::env::Vars{,Os}](https://github.com/rust-lang/rust/pull/155153)
  73. - [Fix that in some attributes, arguments were not properly rejected](https://github.com/rust-lang/rust/pull/155193)
  74. - [`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)
  75. - [Correctly check whether types have equal size in `transmute()` when some `repr` attributes are involved.](https://github.com/rust-lang/rust/pull/155418)
  76. - [More characters are escaped when printing strings and chars](https://github.com/rust-lang/rust/pull/155527)
  77. - [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.
  78. - [Add temporary scope to `assert_eq` and `assert_ne`](https://github.com/rust-lang/rust/pull/155739)
  79. - 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.
  80. - [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.
  81. - [The UNSAFE\_CODE lint is now consistently emitted for all unsafe attributes](https://github.com/rust-lang/rust/pull/157201)
  82. - [Solaris: remove `File::lock` implementation, it has the wrong semantics (return "unsupported" instead)](https://github.com/rust-lang/rust/pull/157509)
  83. - [Windows-gnu targets now specify baseline tools versions](https://github.com/rust-lang/rust/pull/158020)
  84. - [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.

vedi su githubimported 2026-09-28 via github-releases