error[E0502]: cannot borrow `*v` as mutable because it is also borrowed as immutable --> $DIR/borrowck-lend-flow.rs:24:16 | LL | let _w = &v; | -- immutable borrow occurs here LL | borrow_mut(&mut *v); | ^^^^^^^ mutable borrow occurs here LL | _w.use_ref(); | -- immutable borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0502`.