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See individual commits in https://github.com/google/comprehensive-rust/pull/2805. Fixes #2734.
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Unsafe Functions
A function or method can be marked unsafe if it has extra preconditions you
must uphold to avoid undefined behaviour.
Unsafe functions may come from two places:
- Rust functions declared unsafe.
- Unsafe foreign functions in
extern "C"blocks.
We will look at the two kinds of unsafe functions next.