Rust 2024: update Ch. 20 for new unsafe rules
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chriskrycho
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- `extern` now requires `unsafe extern`, but in turn allows functions within it to be marked as `safe`. Add examples to both effects within the text, and update listing numbers accordingly. - `#[no_mangle]` now requires `#[unsafe(no_mangle)]` These are all backwards-compatible, so we can opt the chapter into using the new rules without issue.
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externnow requiresunsafe extern, but in turn allows functions within it to be marked assafe. Add examples to both effects within the text, and update listing numbers accordingly.#[no_mangle]now requires#[unsafe(no_mangle)]These are all backwards-compatible, so we can opt the chapter into using the new rules without issue.