error[E0277]: the trait bound `(): CoerceUnsized<*const [u8]>` is not satisfied
  --> $DIR/issue-44861.rs:21:5
   |
LL |     type Data2: CoerceUnsized<*const [u8]>;
   |                 -------------------------- required by this bound in `Smartass::Data2`
...
LL |     default type Data2 = ();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `CoerceUnsized<*const [u8]>` is not implemented for `()`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.