error[E0502]: cannot borrow `v` as mutable because it is also borrowed as immutable --> $DIR/borrowck-loan-vec-content.rs:18:9 | LL | takes_imm_elt( | ------------- immutable borrow later used by call LL | &v[0], | - immutable borrow occurs here LL | || { | ^^ mutable borrow occurs here LL | v[1] = 4; | - second borrow occurs due to use of `v` in closure error: aborting due to previous error For more information about this error, try `rustc --explain E0502`.