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Chapter 5. Changes in Rust 1.92.0 Toolset

Red Hat Enterprise Linux provides Rust Toolset at version 1.92.0. The previous version was 1.88.0.

  • Language:

    • The never_type_fallback_flowing_into_unsafe and dependency_on_unit_never_type_fallback lints are deny-by-default. They report code that is likely to break when the never type is stabilized. You can allow these lints, but you should fix affected code when they are reported.
    • The unused_must_use lint no longer warns when you ignore Result<(), UninhabitedType> (for example, Result with the never type as the error type) or ControlFlow values whose error variant cannot be constructed.
    • You can use &raw [mut | const] on union fields in safe code.
    • You can combine #[track_caller] and #[no_mangle] when every declaration of the function specifies #[track_caller].

  • Compiler:

    • On Linux, unwind tables are emitted by default even when you build with -C panic=abort, so backtraces work again. Use -C force-unwind-tables=no if you must omit unwind tables.
    • On Red Hat Enterprise Linux 10, Rust 1.92 is built against LLVM 21 through LLVM Toolset. When you install Rust Toolset, ensure that LLVM Toolset provides LLVM 21.

  • Standard library:

    • iter::Repeat::last and iter::Repeat::count now panic instead of looping indefinitely.
    • Stabilized APIs include NonZero::div_ceil, Location::file_as_c_str, RwLockWriteGuard::downgrade, Box::new_zeroed, Box::new_zeroed_slice, and corresponding Rc and Arc methods, and btree_map::Entry::insert_entry.

  • Cargo and Rustdoc:

    • The Cargo book adds an Optimizing Build Performance chapter.
    • Rustdoc search hides trait impl items when the trait item is already shown, and relaxes rules for identifiers in search.

  • Compatibility notes:

    • The invalid_macro_export_arguments lint is deny-by-default and is reported in dependencies. Invalid arguments to #[macro_export] now fail to compile.
    • Downstream impl DerefMut for Pin is no longer permitted.
    • Temporary lifetime extension no longer applies to arguments of non-extended pin! and formatting macros in some cases.

For more information, see the Rust 1.92.0 release announcement and the upstream Rust 1.92.0 release notes.

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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