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Chapter 5. Changes in Rust 1.88.0 Toolset

RHEL provides Rust Toolset in version 1.88.0. Notable enhancements since the previously available version 1.84.1 are the Rust 2024 Edition, async closures, let chains, naked functions, high-performance computing improvements, 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 safer extern blocks which now require the unsafe keyword.
  • Async Closures: The async closures are now stable.
  • Let Chains: This feature allows using && to chain multiple let statements within if and while conditions, enabling more concise complex conditional checks. This feature is 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::arch intrinsics 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_abi future compatibility warning is now a hard error.
  • The missing_abi lint is now warn-by-default, and explicitly specify the ABI in extern blocks.

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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