A few examples:

- Rust forces you to deal with errors and "null" values (Option). If you just unwrap them, it's visible.

- Rust requires systems with clear ownership. You can opt out with various smart pointers, it's visible.

- Rust requires you to use Box for heap allocations, it's visible.

Note: I'm not talking about optimal solutions in the sense of "best algorithm", more in the sense of "well thought out and without lazy shortcuts".