error[E0764]: mutable references are not allowed in the final value of constants
  --> $DIR/issue-17718-const-bad-values.rs:1:34
   |
LL | const C1: &'static mut [usize] = &mut [];
   |                                  ^^^^^^^

error[E0013]: constants cannot refer to statics
  --> $DIR/issue-17718-const-bad-values.rs:5:46
   |
LL | const C2: &'static mut usize = unsafe { &mut S };
   |                                              ^
   |
   = help: consider extracting the value of the `static` to a `const`, and referring to that

error[E0013]: constants cannot refer to statics
  --> $DIR/issue-17718-const-bad-values.rs:5:46
   |
LL | const C2: &'static mut usize = unsafe { &mut S };
   |                                              ^
   |
   = help: consider extracting the value of the `static` to a `const`, and referring to that
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0013, E0764.
For more information about an error, try `rustc --explain E0013`.