1 error[E0499]: cannot borrow `foo[_]` as mutable more than once at a time
2 --> $DIR/suggest-split-at-mut.rs:4:13
4 LL | let a = &mut foo[2];
5 | ----------- first mutable borrow occurs here
6 LL | let b = &mut foo[3];
7 | ^^^^^^^^^^^ second mutable borrow occurs here
9 | ------ first borrow later used here
11 = help: consider using `.split_at_mut(position)` or similar method to obtain two mutable non-overlapping sub-slices
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0499`.