# Borrowing rules ## Example Execute the following command to run [`./solutions/examples/borrow.rs`](https://github.com/Cyfrin/rust-crash-course/blob/main/topics/borrowing_rules/solutions/examples/borrow.rs) ```shell cargo run --example borrow ``` Execute the following command to run [`./solutions/examples/borrow_func.rs`](https://github.com/Cyfrin/rust-crash-course/blob/main/topics/borrowing_rules/solutions/examples/borrow_func.rs) ```shell cargo run --example borrow_func ``` ## Exercises Exercises are in [`./exercises/src/main.rs`](https://github.com/Cyfrin/rust-crash-course/blob/main/topics/borrowing_rules/exercises/src/main.rs) ### Exercise 1 ```rust let s = String::from("Rust"); let s1 = &mut s; let s2 = &mut s; ``` Modify 2 lines to fix this code. `s1` and `s2` must be references to `s`. ### Exercise 2 ```rust let mut s = String::from("Rust"); let s1 = &mut s; let s2 = &mut s; ``` Comment out a single line to fix the code. `s1` must be a reference. ### Exercise 3 ```rust let s = String::from("Rust"); print_len(s); ``` Modify the function definition of `print_len` so that the code compiles. ## Test ```shell cargo test ```