error[E0596]: cannot borrow `x` as mutable, as it is not declared as mutable --> $DIR/borrowck-access-permissions.rs:9:19 | LL | let _y1 = &mut x; | ^^^^^^ cannot borrow as mutable | help: consider changing this to be mutable | LL | let mut x = 1; | +++ error[E0596]: cannot borrow immutable static item `static_x` as mutable --> $DIR/borrowck-access-permissions.rs:14:19 | LL | let _y1 = &mut static_x; | ^^^^^^^^^^^^^ cannot borrow as mutable error[E0596]: cannot borrow `*box_x` as mutable, as `box_x` is not declared as mutable --> $DIR/borrowck-access-permissions.rs:22:19 | LL | let _y1 = &mut *box_x; | ^^^^^^^^^^^ cannot borrow as mutable | help: consider changing this to be mutable | LL | let mut box_x = Box::new(1); | +++ error[E0596]: cannot borrow `*ref_x` as mutable, as it is behind a `&` reference --> $DIR/borrowck-access-permissions.rs:30:19 | LL | let _y1 = &mut *ref_x; | ^^^^^^^^^^^ `ref_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 | let ref_x = &mut x; | ~~~~~~ error[E0596]: cannot borrow `*ptr_x` as mutable, as it is behind a `*const` pointer --> $DIR/borrowck-access-permissions.rs:39:23 | LL | let _y1 = &mut *ptr_x; | ^^^^^^^^^^^ `ptr_x` is a `*const` pointer, so the data it refers to cannot be borrowed as mutable | help: consider changing this to be a mutable pointer | LL | let ptr_x : *const _ = &mut x; | ~~~~~~ error[E0596]: cannot borrow `*foo_ref.f` as mutable, as it is behind a `&` reference --> $DIR/borrowck-access-permissions.rs:48:18 | LL | let _y = &mut *foo_ref.f; | ^^^^^^^^^^^^^^^ `foo_ref` is a `&` reference, so the data it refers to cannot be borrowed as mutable | help: consider changing this to be a mutable reference | LL | let foo_ref = &mut foo; | ~~~~~~~~ error: aborting due to 6 previous errors For more information about this error, try `rustc --explain E0596`.