error[E0790]: cannot refer to the associated constant on trait without specifying the corresponding `impl` type
  --> $DIR/issue-58022.rs:4:25
   |
LL |     const SIZE: usize;
   |     ------------------ `Foo::SIZE` defined here
LL |
LL |     fn new(slice: &[u8; Foo::SIZE]) -> Self;
   |                         ^^^^^^^^^ cannot refer to the associated constant of trait

error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
  --> $DIR/issue-58022.rs:13:41
   |
LL |     fn new(slice: &[u8; Self::SIZE]) -> Self {
   |                                         ^^^^ doesn't have a size known at compile-time
   |
   = help: within `Bar<[u8]>`, the trait `Sized` is not implemented for `[u8]`
note: required because it appears within the type `Bar<[u8]>`
  --> $DIR/issue-58022.rs:8:12
   |
LL | pub struct Bar<T: ?Sized>(T);
   |            ^^^
   = note: the return type of a function must have a statically known size

error[E0423]: expected function, tuple struct or tuple variant, found trait `Foo`
  --> $DIR/issue-58022.rs:15:9
   |
LL |         Foo(Box::new(*slice))
   |         ^^^ not a function, tuple struct or tuple variant

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0277, E0423, E0790.
For more information about an error, try `rustc --explain E0277`.