error: extern mutable statics are not allowed with `#[linkage]`
  --> $DIR/linkage-attr-mutable-static.rs:9:9
   |
LL |         #[linkage = "extern_weak"]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: marking the extern static mutable would allow changing which symbol the static references rather than make the target of the symbol mutable

error: aborting due to 1 previous error