also borrowed as mutable --> src/main.rs:6:22 | 4 | let number_ref_mut = &mut number; | ----------- mutable borrow occurs here 5 | 6 | println!("{:?}", number); | ^^^^^^ immutable borrow occurs here 7 | println!("{:?}", number_ref_mut); | -------------- mutable borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0502`. error: could not compile `aaa`. To learn more, run the command again with --verbose. 18