Rust 1.78, simply launched as the newest model of the widespread, 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 workforce 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 aren’t supported by all compilers.
Introduced Could 2, Rust 1.78 will be put in by way of rustup:
$ rustup replace secure
One other function in Rust 1.78 pertains to asserting unsafe preconditions. The Rust normal library has various 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. Because the library often 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 consumer’s setting for debug assertions, enabled by default in debug and check builds. This modification will assist catch undefined habits in code, the Rust workforce stated. Nonetheless, the small print of how a lot is checked typically are usually not secure.
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 apply. These caveats largely existed as a hedge towards const analysis, however they had been solely secure for non-const use. Now, they’re promised to have constant runtime habits in line with precise inputs.
Rust 1.78 additionally stabilizes various APIs, raises its minimal requirement to Home windows 10 for targets comparable to 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 had been made, Rust 1.77.1, which disabled new Cargo habits 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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