error[E0321]: cross-crate traits with a default impl, like `std::marker::Send`, can only be implemented for a struct/enum type, not `&'static main::Foo`
- --> $DIR/empty_span.rs:18:5
+ --> $DIR/empty_span.rs:17:5
|
-18 | unsafe impl Send for &'static Foo { }
+17 | unsafe impl Send for &'static Foo { }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error