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806260e973
Document that "extern blocks must be unsafe" in Rust 2024 The [documentation on `extern`](https://doc.rust-lang.org/std/keyword.extern.html) contains the following code sample: ```rust #[link(name = "my_c_library")] extern "C" { fn my_c_function(x: i32) -> bool; } ``` Due to #123743, attempting to compile such code with the 2024 edition of Rust fails: ``` error: extern blocks must be unsafe ``` This PR extends the `extern` documentation with a brief explanation of the new requirement. It also adds the missing `unsafe` keyword to the code sample, which should be compatible with rustc since v1.82. **Related docs:** - https://doc.rust-lang.org/reference/items/external-blocks.html - https://doc.rust-lang.org/edition-guide/rust-2024/unsafe-extern.html