Rust
- called `Option::unwrap()` on a `None` value
- cannot borrow as mutable because it is also borrowed as immutable
- error[E0382]: borrow of moved value
- error[E0507]: cannot move out of 'x' which is behind a shared reference
- error[E0599]: no method named 'x' found for struct
- Rust: cannot borrow as mutable
- Rust: cannot borrow as mutable because it is also borrowed as immutable
- Rust: missing lifetime specifier