error: generic `Self` types are currently not permitted in anonymous constants
  --> $DIR/self-ty-in-const-2.rs:17:41
   |
LL |         let _: [u8; std::mem::size_of::<Self>()];
   |                                         ^^^^
   |
note: not a concrete type
  --> $DIR/self-ty-in-const-2.rs:15:17
   |
LL | impl<T> Baz for Bar<T> {
   |                 ^^^^^^

error: aborting due to previous error