1 error[E0499]: cannot borrow `*s` as mutable more than once at a time
2 --> $DIR/issue-18566.rs:33:19
7 | | | second mutable borrow occurs here
8 | | first mutable borrow occurs here
9 | borrow later used here
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0499`.