error[E0017]: references in constants may only refer to immutable values
  --> $DIR/E0017.rs:4:30
   |
LL | const CR: &'static mut i32 = &mut C;
   |                              ^^^^^^ constants require immutable values

error[E0017]: references in statics may only refer to immutable values
  --> $DIR/E0017.rs:5:39
   |
LL | static STATIC_REF: &'static mut i32 = &mut X;
   |                                       ^^^^^^ statics require immutable values

error: cannot mutate statics in the initializer of another static
  --> $DIR/E0017.rs:5:39
   |
LL | static STATIC_REF: &'static mut i32 = &mut X;
   |                                       ^^^^^^

error[E0596]: cannot borrow immutable static item as mutable
  --> $DIR/E0017.rs:5:44
   |
LL | static STATIC_REF: &'static mut i32 = &mut X;
   |                                            ^

error[E0017]: references in statics may only refer to immutable values
  --> $DIR/E0017.rs:8:38
   |
LL | static CONST_REF: &'static mut i32 = &mut C;
   |                                      ^^^^^^ statics require immutable values

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0017, E0596.
For more information about an error, try `rustc --explain E0017`.