error[E0620]: cast to unsized type: `&{integer}` as `std::marker::Send` --> $DIR/cast-to-unsized-trait-object-suggestion.rs:12:5 | LL | &1 as Send; //~ ERROR cast to unsized | ^^^^^^---- | | | help: try casting to a reference instead: `&Send` error[E0620]: cast to unsized type: `std::boxed::Box<{integer}>` as `std::marker::Send` --> $DIR/cast-to-unsized-trait-object-suggestion.rs:13:5 | LL | Box::new(1) as Send; //~ ERROR cast to unsized | ^^^^^^^^^^^^^^^---- | | | help: try casting to a `Box` instead: `Box` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0620`.