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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 include:

  • 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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