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1.88.0 release notes #142828

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1.88.0 release notes
Mark-Simulacrum Jun 21, 2025
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Indicate change is coming in the next release.
Mark-Simulacrum Jun 22, 2025
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Version 1.88.0 (2025-06-26)
==========================

<a id="1.88.0-Language"></a>

Language
--------
- [Stabilize `#![feature(let_chains)]` in the 2024 edition.](https://github.com/rust-lang/rust/pull/132833)
This feature allows `&&`-chaining `let` statements inside `if` and `while`, allowing intermixture with boolean expressions. The patterns inside the `let` sub-expressions can be irrefutable or refutable.
- [Stabilize `#![feature(naked_functions)]`.](https://github.com/rust-lang/rust/pull/134213)
Naked functions allow writing functions with no compiler-generated epilogue and prologue, allowing full control over the generated assembly for a particular function.
- [Stabilize `#![feature(cfg_boolean_literals)]`.](https://github.com/rust-lang/rust/pull/138632)
This allows using boolean literals as `cfg` predicates, e.g. `#[cfg(true)]` and `#[cfg(false)]`.
- [Fully de-stabilize the `#[bench]` attribute](https://github.com/rust-lang/rust/pull/134273). Usage of `#[bench]` without `#![feature(custom_test_frameworks)]` already triggered a deny-by-default future-incompatibility lint since Rust 1.77, but will now become a hard error.
- [Add warn-by-default `dangerous_implicit_autorefs` lint against implicit autoref of raw pointer dereference.](https://github.com/rust-lang/rust/pull/123239)
The lint [will be bumped to deny-by-default](https://github.com/rust-lang/rust/pull/141661) in the next version of Rust.
- [Add `invalid_null_arguments` lint to prevent invalid usage of null pointers.](https://github.com/rust-lang/rust/pull/119220)
This lint is uplifted from `clippy::invalid_null_ptr_usage`.
- [Change trait impl candidate preference for builtin impls and trivial where-clauses.](https://github.com/rust-lang/rust/pull/138176)
- [Check types of generic const parameter defaults](https://github.com/rust-lang/rust/pull/139646)

<a id="1.88.0-Compiler"></a>

Compiler
--------
- [Stabilize `-Cdwarf-version` for selecting the version of DWARF debug information to generate.](https://github.com/rust-lang/rust/pull/136926)


<a id="1.88.0-Platform-Support"></a>

Platform Support
----------------
- [Demote `i686-pc-windows-gnu` to Tier 2.](https://blog.rust-lang.org/2025/05/26/demoting-i686-pc-windows-gnu/)


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="1.88.0-Libraries"></a>

Libraries
---------
- [Remove backticks from `#[should_panic]` test failure message.](https://github.com/rust-lang/rust/pull/136160)
- [Guarantee that `[T; N]::from_fn` is generated in order of increasing indices.](https://github.com/rust-lang/rust/pull/139099), for those passing it a stateful closure.
- [The libtest flag `--nocapture` is deprecated in favor of the more consistent `--no-capture` flag.](https://github.com/rust-lang/rust/pull/139224)
- [Guarantee that `{float}::NAN` is a quiet NaN.](https://github.com/rust-lang/rust/pull/139483)


<a id="1.88.0-Stabilized-APIs"></a>

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

- [`Cell::update`](https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#method.update)
- [`impl Default for *const T`](https://doc.rust-lang.org/nightly/std/primitive.pointer.html#impl-Default-for-*const+T)
- [`impl Default for *mut T`](https://doc.rust-lang.org/nightly/std/primitive.pointer.html#impl-Default-for-*mut+T)
- [`HashMap::extract_if`](https://doc.rust-lang.org/stable/std/collections/struct.HashMap.html#method.extract_if)
- [`HashSet::extract_if`](https://doc.rust-lang.org/stable/std/collections/struct.HashSet.html#method.extract_if)
- [`proc_macro::Span::line`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.line)
- [`proc_macro::Span::column`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.column)
- [`proc_macro::Span::start`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.start)
- [`proc_macro::Span::end`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.end)
- [`proc_macro::Span::file`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.file)
- [`proc_macro::Span::local_file`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.local_file)

These previously stable APIs are now stable in const contexts:

- [`NonNull<T>::replace`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.replace)
- [`<*mut T>::replace`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.replace)
- [`std::ptr::swap_nonoverlapping`](https://github.com/rust-lang/rust/pull/137280)
- [`Cell::{replace, get, get_mut, from_mut, as_slice_of_cells}`](https://github.com/rust-lang/rust/pull/137928)


<a id="1.88.0-Cargo"></a>

Cargo
-----
- [Stabilize automatic garbage collection.](https://github.com/rust-lang/cargo/pull/14287/)
- [use `zlib-rs` for gzip compression in rust code](https://github.com/rust-lang/cargo/pull/15417/)

<a id="1.88.0-Rustdoc"></a>

Rustdoc
-----
- [Doctests can be ignored based on target names using `ignore-*` attributes.](https://github.com/rust-lang/rust/pull/137096)
- [Stabilize the `--test-runtool` and `--test-runtool-arg` CLI options to specify a program (like qemu) and its arguments to run a doctest.](https://github.com/rust-lang/rust/pull/137096)

<a id="1.88.0-Compatibility-Notes"></a>

Compatibility Notes
-------------------
- [Finish changing the internal representation of pasted tokens](https://github.com/rust-lang/rust/pull/124141). Certain invalid declarative macros that were previously accepted in obscure circumstances are now correctly rejected by the compiler. Use of a `tt` fragment specifier can often fix these macros.
- [Fully de-stabilize the `#[bench]` attribute](https://github.com/rust-lang/rust/pull/134273). Usage of `#[bench]` without `#![feature(custom_test_frameworks)]` already triggered a deny-by-default future-incompatibility lint since Rust 1.77, but will now become a hard error.
- [Fix borrow checking some always-true patterns.](https://github.com/rust-lang/rust/pull/139042)
The borrow checker was overly permissive in some cases, allowing programs that shouldn't have compiled.
- [Update the minimum external LLVM to 19.](https://github.com/rust-lang/rust/pull/139275)
- [Make it a hard error to use a vector type with a non-Rust ABI without enabling the required target feature.](https://github.com/rust-lang/rust/pull/139309)

Version 1.87.0 (2025-05-15)
==========================

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