error[E0596]: cannot borrow `z.x` as mutable, as `z` is not declared as mutable
  --> $DIR/issue-39544.rs:11:13
   |
LL |     let _ = &mut z.x;
   |             ^^^^^^^^ cannot borrow as mutable
   |
help: consider changing this to be mutable
   |
LL |     let mut z = Z { x: X::Y };
   |         +++

error[E0596]: cannot borrow `self.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:16:17
   |
LL |         let _ = &mut self.x;
   |                 ^^^^^^^^^^^ `self` 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 foo<'z>(&'z mut self) {
   |                ~~~~~~~~~~~~

error[E0596]: cannot borrow `self.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:20:17
   |
LL |         let _ = &mut self.x;
   |                 ^^^^^^^^^^^ `self` 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 foo1(&mut self, other: &Z) {
   |             ~~~~~~~~~

error[E0596]: cannot borrow `other.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:21:17
   |
LL |         let _ = &mut other.x;
   |                 ^^^^^^^^^^^^ `other` 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 foo1(&self, other: &mut Z) {
   |                            +++

error[E0596]: cannot borrow `self.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:25:17
   |
LL |         let _ = &mut self.x;
   |                 ^^^^^^^^^^^ `self` 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 foo2<'a>(&'a mut self, other: &Z) {
   |                 ~~~~~~~~~~~~

error[E0596]: cannot borrow `other.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:26:17
   |
LL |         let _ = &mut other.x;
   |                 ^^^^^^^^^^^^ `other` 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 foo2<'a>(&'a self, other: &mut Z) {
   |                                   +++

error[E0596]: cannot borrow `self.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:30:17
   |
LL |         let _ = &mut self.x;
   |                 ^^^^^^^^^^^ `self` 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 foo3<'a>(self: &'a mut Self, other: &Z) {
   |                           +++

error[E0596]: cannot borrow `other.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:31:17
   |
LL |         let _ = &mut other.x;
   |                 ^^^^^^^^^^^^ `other` 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 foo3<'a>(self: &'a Self, other: &mut Z) {
   |                                         +++

error[E0596]: cannot borrow `other.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:35:17
   |
LL |         let _ = &mut other.x;
   |                 ^^^^^^^^^^^^ `other` 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 foo4(other: &mut Z) {
   |                     +++

error[E0596]: cannot borrow `z.x` as mutable, as `z` is not declared as mutable
  --> $DIR/issue-39544.rs:41:13
   |
LL |     let _ = &mut z.x;
   |             ^^^^^^^^ cannot borrow as mutable
   |
help: consider changing this to be mutable
   |
LL | pub fn with_arg(mut z: Z, w: &Z) {
   |                 +++

error[E0596]: cannot borrow `w.x` as mutable, as it is behind a `&` reference
  --> $DIR/issue-39544.rs:42:13
   |
LL |     let _ = &mut w.x;
   |             ^^^^^^^^ `w` is a `&` reference, so the data it refers to cannot be borrowed as mutable
   |
help: consider changing this to be a mutable reference
   |
LL | pub fn with_arg(z: Z, w: &mut Z) {
   |                           +++

error[E0594]: cannot assign to `*x.0`, which is behind a `&` reference
  --> $DIR/issue-39544.rs:48:5
   |
LL |     *x.0 = 1;
   |     ^^^^^^^^ cannot assign

error: aborting due to 12 previous errors

Some errors have detailed explanations: E0594, E0596.
For more information about an error, try `rustc --explain E0594`.