1error[E0596]: cannot borrow `*buf` as mutable, as it is behind a `&` reference 2 --> $DIR/issue-40823.rs:3:5 3 | 4LL | let mut buf = &[1, 2, 3, 4]; 5 | ------------- help: consider changing this to be a mutable reference: `&mut [1, 2, 3, 4]` 6LL | buf.iter_mut(); 7 | ^^^^^^^^^^^^^^ `buf` is a `&` reference, so the data it refers to cannot be borrowed as mutable 8 9error: aborting due to previous error 10 11For more information about this error, try `rustc --explain E0596`. 12