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Update mutable-static-variables.md (#1331)

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From a discussion in #1297.
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Martin Geisler 2023-10-09 15:15:26 +02:00 committed by GitHub
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src/unsafe/mutable-static-variables.md
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@ -29,7 +29,11 @@ fn main() {
<details>
Using a mutable static is generally a bad idea, but there are some cases where it might make sense
in low-level `no_std` code, such as implementing a heap allocator or working with some C APIs.
- The program here is safe because it is single-threaded. However, the Rust compiler is conservative
and will assume the worst. Try removing the `unsafe` and see how the compiler explains that it is
undefined behavior to mutate a static from multiple threads.
- Using a mutable static is generally a bad idea, but there are some cases where it might make sense
in low-level `no_std` code, such as implementing a heap allocator or working with some C APIs.
</details>