Rust 1.78, simply launched as the newest model of the fashionable, memory-safe programming language, provides backing for a #[diagnostic] attribute namespace to affect compiler messages.
These messages are handled as hints that the compiler is just not required to make use of, the Rust crew stated. Additionally it isn’t an error to supply a diagnostic that the compiler doesn’t acknowledge. The function is designed to permit supply code to supply diagnostics even when they don’t seem to be supported by all compilers.
Introduced Might 2, Rust 1.78 might be put in by way of rustup:
$ rustup replace steady
One other function in Rust 1.78 pertains to asserting unsafe preconditions. The Rust normal library has plenty of assertions for preconditions of unsafe features, however traditionally they’ve been enabled solely in #[cfg(debug_assertions)] builds of the library to keep away from affecting launch efficiency. For the reason that library normally is compiled and distributed in launch mode, most Rust builders weren’t executing these checks.
With Rust 1.78, the situation for these assertions is delayed till code era, so they are going to be checked relying on the person’s setting for debug assertions, enabled by default in debug and take a look at builds. This alteration will assist catch undefined conduct in code, the Rust crew stated. Nevertheless, the main points of how a lot is checked usually are usually not steady.
Deterministic realignment is also featured in Rust 1.78. The usual library has features that change alignment of pointers and slices, however they beforehand had caveats that made them troublesome to depend on in follow. These caveats largely existed as a hedge towards const analysis, however they have been solely steady for non-const use. Now, they’re promised to have constant runtime conduct in response to precise inputs.
Rust 1.78 additionally stabilizes plenty of APIs, raises its minimal requirement to Home windows 10 for targets resembling x_86-pc-windows-msvc, and upgrades its bundled LLVM to LLVM 18.
Rust 1.78 follows the March 21 launch of Rust 1.77, which featured assist for C-string literals. Two subsequent level releases additionally have been made, Rust 1.77.1, which disabled new Cargo conduct on Home windows for targets utilizing MSVC (Microsoft C and C++), and Rust 1.77.2, which included a vulnerability repair.
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