error[E0502]: cannot borrow `this.x` as mutable because it is also borrowed as immutable --> $DIR/borrowck-closures-unique-imm.rs:11:9 | LL | let p = &this.x; | ------- immutable borrow occurs here LL | &mut this.x; | ^^^^^^^^^^^ mutable borrow occurs here LL | p.use_ref(); | - immutable borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0502`.