error[E0596]: cannot borrow `x` as mutable, as it is not declared as mutable --> $DIR/borrowck-borrow-overloaded-deref-mut.rs:29:25 | LL | let __isize = &mut *x; | ^ cannot borrow as mutable | help: consider changing this to be mutable | LL | fn deref_mut1(mut x: Own) { | +++ error[E0596]: cannot borrow `*x` as mutable, as it is behind a `&` reference --> $DIR/borrowck-borrow-overloaded-deref-mut.rs:41:11 | LL | &mut **x | ^^ `x` is a `&` reference, so the data it refers to cannot be borrowed as mutable | help: consider changing this to be a mutable reference | LL | fn deref_extend_mut1<'a>(x: &'a mut Own) -> &'a mut isize { | +++ error[E0596]: cannot borrow `x` as mutable, as it is not declared as mutable --> $DIR/borrowck-borrow-overloaded-deref-mut.rs:49:6 | LL | *x = 3; | ^ cannot borrow as mutable | help: consider changing this to be mutable | LL | fn assign1<'a>(mut x: Own) { | +++ error[E0596]: cannot borrow `*x` as mutable, as it is behind a `&` reference --> $DIR/borrowck-borrow-overloaded-deref-mut.rs:53:6 | LL | **x = 3; | ^^ `x` is a `&` reference, so the data it refers to cannot be borrowed as mutable | help: consider changing this to be a mutable reference | LL | fn assign2<'a>(x: &'a mut Own) { | +++ error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0596`.