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Systems · hard

38. Unsafe Rust

Escaping the checker responsibly.

`unsafe` enables raw pointer dereference, FFI calls, unions and mutable statics. It does not disable the borrow checker elsewhere — it shifts the proof burden to you. Keep unsafe blocks tiny and wrap them in safe abstractions with documented invariants.

Check your understanding

  1. 1. Does unsafe turn off the borrow checker?

  2. 2. Best practice for unsafe code is…