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Chapter 5. Changes in Rust 1.88.0 Toolset
Red Hat Enterprise Linux provides Rust Toolset at version 1.88.0. The previous version was 1.84.1. Notable enhancements include the Rust 2024 Edition, async closures, let chains, naked functions, high-performance computing, trait upcasting, and standard library improvements.
-
Rust 2024 Edition: The Rust 2024 Edition is now stable. It introduces changes such as refined capture rules for
impl Trait, and saferexternblocks which now require theunsafekeyword. -
Async Closures: The
asyncclosures are now stable. -
Let Chains: In
ifandwhileconditions, you can use&&to chain multipleletstatements, which shortens complex conditional logic. Let chains are available only in the Rust 2024 Edition. -
Naked Functions: Developers can now define "naked functions" using the
#[unsafe(naked)]attribute. These functions do not have a compiler-generated prologue or epilogue, providing full control over the assembly code. -
High-performance computing: When you enable target features, you can call multiple
std::archintrinsics directly in safe Rust, which gives you direct access to specific CPU features. - Trait Upcasting: It is now possible to upcast trait objects to their supertraits, improving flexibility when working with trait objects.
Standard Library Improvements:
- Anonymous Pipes: Access to anonymous pipes is now available in the standard library.
Mutable Multiple Element Indexing: `HashMap`s and slices now support safely retrieving mutable references to multiple elements simultaneously.
- Compatibility notes
-
The
#[bench]attribute has been fully de-stabilized and its usage will result in a hard error. -
The
wasm_c_abifuture compatibility warning is now a hard error. -
The
missing_abilint is now warn-by-default. You must explicitly specify the ABI inexternblocks.
Rust Toolset is a rolling Application Stream, and Red Hat only supports the latest version. For more information, see the Red Hat Enterprise Linux Application Streams Life Cycle document.
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