error[E0658]: references in statics may only refer to immutable values
  --> $DIR/issue-46604.rs:1:25
   |
LL | static buf: &mut [u8] = &mut [1u8,2,3,4,5,7];
   |                         ^^^^^^^^^^^^^^^^^^^^ statics require immutable values
   |
   = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
   = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable

error[E0594]: cannot assign to `buf[_]`, as `buf` is an immutable static item
  --> $DIR/issue-46604.rs:6:5
   |
LL |     buf[0]=2;
   |     ^^^^^^^^ cannot assign

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0594, E0658.
For more information about an error, try `rustc --explain E0594`.