error[E0017]: references in statics may only refer to immutable values
  --> $DIR/issue-46604.rs:14:25
   |
LL | static buf: &mut [u8] = &mut [1u8,2,3,4,5,7];   //[ast]~ ERROR E0017
   |                         ^^^^^^^^^^^^^^^^^^^^ statics require immutable values

error[E0389]: cannot assign to data in a `&` reference
  --> $DIR/issue-46604.rs:20:5
   |
LL |     buf[0]=2;                                   //[ast]~ ERROR E0389
   |     ^^^^^^^^ assignment into an immutable reference

error: aborting due to 2 previous errors

Some errors occurred: E0017, E0389.
For more information about an error, try `rustc --explain E0017`.