error[E0277]: `(dyn Dummy + 'static)` cannot be shared between threads safely --> $DIR/kindck-send-object2.rs:7:5 | LL | assert_send::<&'static dyn Dummy>(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `(dyn Dummy + 'static)` cannot be shared between threads safely | = help: the trait `Sync` is not implemented for `(dyn Dummy + 'static)` = note: required because of the requirements on the impl of `Send` for `&'static (dyn Dummy + 'static)` note: required by a bound in `assert_send` --> $DIR/kindck-send-object2.rs:3:18 | LL | fn assert_send() { } | ^^^^ required by this bound in `assert_send` error[E0277]: `dyn Dummy` cannot be sent between threads safely --> $DIR/kindck-send-object2.rs:12:5 | LL | assert_send::>(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `dyn Dummy` cannot be sent between threads safely | = help: the trait `Send` is not implemented for `dyn Dummy` = note: required because of the requirements on the impl of `Send` for `Unique` = note: required because it appears within the type `Box` note: required by a bound in `assert_send` --> $DIR/kindck-send-object2.rs:3:18 | LL | fn assert_send() { } | ^^^^ required by this bound in `assert_send` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0277`.