Add 1.82 release notes

RELEASES.md

@@ -1,3 +1,104 @@
+Version 1.82.0 (2024-10-17)
+==========================
+
+<a id="1.82.0-Language"></a>
+
+Language
+--------
+- [Don't make statement nonterminals match pattern nonterminals](https://github.com/rust-lang/rust/pull/120221/)
+- [Patterns matching empty types can now be omitted in common cases](https://github.com/rust-lang/rust/pull/122792)
+- [Enforce supertrait outlives obligations when using trait impls](https://github.com/rust-lang/rust/pull/124336)
+- [`addr_of(_mut)!` macros and the newly stabilized `&raw (const|mut)` are now safe to use with all static items](https://github.com/rust-lang/rust/pull/125834)
+- [size_of_val_raw: for length 0 this is safe to call](https://github.com/rust-lang/rust/pull/126152/)
+- [Reorder trait bound modifiers *after* `for<...>` binder in trait bounds](https://github.com/rust-lang/rust/pull/127054/)
+- [Stabilize opaque type precise capturing (RFC 3617)](https://github.com/rust-lang/rust/pull/127672)
+- [Stabilize `&raw const` and `&raw mut` operators (RFC 2582)](https://github.com/rust-lang/rust/pull/127679)
+- [Stabilize unsafe extern blocks (RFC 3484)](https://github.com/rust-lang/rust/pull/127921)
+- [Stabilize nested field access in `offset_of!`](https://github.com/rust-lang/rust/pull/128284)
+- [Do not require `T` to be live when dropping `[T; 0]`](https://github.com/rust-lang/rust/pull/128438)
+- [Stabilize `const` operands in inline assembly](https://github.com/rust-lang/rust/pull/128570)
+- [Stabilize floating-point arithmetic in `const fn`](https://github.com/rust-lang/rust/pull/128596)
+- [Stabilize explicit opt-in to unsafe attributes](https://github.com/rust-lang/rust/pull/128771)
+- [Document NaN bit patterns guarantees](https://github.com/rust-lang/rust/pull/129559)
+
+
+<a id="1.82.0-Compiler"></a>
+
+Compiler
+--------
+- [Promote riscv64gc-unknown-linux-musl to tier 2](https://github.com/rust-lang/rust/pull/122049)
+- [Promote Mac Catalyst targets `aarch64-apple-ios-macabi` and `x86_64-apple-ios-macabi` to Tier 2, and ship them with rustup](https://github.com/rust-lang/rust/pull/126450)
+- [Add tier 3 NuttX based targets for RISC-V and ARM](https://github.com/rust-lang/rust/pull/127755)
+- [Add tier 3 powerpc-unknown-linux-muslspe target](https://github.com/rust-lang/rust/pull/127905)
+- [Improved diagnostics to explain why a pattern is unreachable](https://github.com/rust-lang/rust/pull/128034)
+- [The compiler now triggers the unreachable code warning properly for async functions that don't return/are `-> !`](https://github.com/rust-lang/rust/pull/128443)
+- [Promote `aarch64-apple-darwin` to Tier 1](https://github.com/rust-lang/rust/pull/128592)
+- [Add Trusty OS target `aarch64-unknown-trusty` and `armv7-unknown-trusty` as tier 3 targets](https://github.com/rust-lang/rust/pull/129490)
+- [Promote `wasm32-wasip2` to Tier 2.](https://github.com/rust-lang/rust/pull/126967/)
+
+
+<a id="1.82.0-Libraries"></a>
+
+Libraries
+---------
+- [Implement DoubleEnded and ExactSize for Take<Repeat> and Take<RepeatWith>](https://github.com/rust-lang/rust/pull/106943/)
+- [Stabilize Wasm relaxed SIMD](https://github.com/rust-lang/rust/pull/117468/)
+- [Stabilize const `{integer}::from_str_radix` i.e. `const_int_from_str`](https://github.com/rust-lang/rust/pull/124941/)
+- [Generalize `{Rc,Arc}::make_mut()` to `Path`, `OsStr`, and `CStr`.](https://github.com/rust-lang/rust/pull/126877)
+- [impl `Default` for collection iterators that don't already have it](https://github.com/rust-lang/rust/pull/128261/)
+
+
+<a id="1.82.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+<a id="1.82.0-Cargo"></a>
+
+Cargo
+-----
+- [feat: Add `info` cargo subcommand](https://github.com/rust-lang/cargo/pull/14141/)
+
+<a id="1.82.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+ - We now [disallow setting some built-in cfgs via the command-line](https://github.com/rust-lang/rust/pull/126158) with the newly added [`explicit_builtin_cfgs_in_flags`](https://doc.rust-lang.org/rustc/lints/listing/deny-by-default.html#explicit-builtin-cfgs-in-flags) lint in order to prevent incoherent state, eg. `windows` cfg active but target is Linux based. The appropriate [`rustc` flag](https://doc.rust-lang.org/rustc/command-line-arguments.html) should be used instead.
+- The standard library has a new implementation of `binary_search` which is significantly improves performance (#128254). However when a sorted slice has multiple values which compare equal, the new implementation may select a different value among the equal ones than the old implementation.
+- [illumos/Solaris now sets `MSG_NOSIGNAL` when writing to sockets](https://github.com/rust-lang/rust/pull/128259). This avoids killing the process with SIGPIPE when writing to a closed socket, which matches the existing behavior on other UNIX targets.
+- [Removes a problematic hack that always passed the --whole-archive linker flag for tests, which may cause linker errors for code accidentally relying on it.](https://github.com/rust-lang/rust/pull/128400)
+- The WebAssembly target features `multivalue` and `reference-types` are now
+  both enabled by default. These two features both have subtle changes implied
+  for generated WebAssembly binaries. For the `multivalue` feature, WebAssembly
+  target support has changed when upgrading to LLVM 19. Support for generating
+  functions with multiple returns no longer works and
+  `-Ctarget-feature=+multivalue` has a different meaning than it did in LLVM 18
+  and prior. There is no longer any supported means to generate a module that has
+  a function with multiple returns in WebAssembly from Rust source code. For the
+  `reference-types` feature the encoding of immediates in the `call_indirect`, a
+  commonly used instruction by the WebAssembly backend, has changed. Validators
+  and parsers which don't understand the `reference-types` proposal will no
+  longer accept modules produced by LLVM due to this change in encoding of
+  immediates. Additionally these features being enabled are encoded in the
+  `target_features` custom section and may affect downstream tooling such as
+  `wasm-opt` consuming the module. Generating a WebAssembly module that disables
+  default features requires `-Zbuild-std` support from Cargo and more information
+  can be found at
+  [rust-lang/rust#128511](https://github.com/rust-lang/rust/pull/128511).
+- [Rust now raises unsafety errors for union patterns in parameter-position](https://github.com/rust-lang/rust/pull/130531)
+
+
+<a id="1.82.0-Internal-Changes"></a>
+
+Internal Changes
+----------------
+
+These changes do not affect any public interfaces of Rust, but they represent
+significant improvements to the performance or internals of rustc and related
+tools.
+
+- [Update to LLVM 19](https://github.com/rust-lang/rust/pull/127513)
+
 Version 1.81.0 (2024-09-05)
 ==========================