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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:7:5
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LL | unsafe impl Send for &'static Foo { }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't implement cross-crate trait with a default impl for non-struct/enum type
error: aborting due to previous error
For more information about this error, try `rustc --explain E0321`.
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