`where Self: Sized` does not seem to be supported

[Ploppz]

I get compiler error:

error[E0038]: the trait `jobs::Job` cannot be made into an object
  --> src/jobs/mod.rs:24:14
   |
24 |     async fn revive(
   |              ^^^^^^ `jobs::Job` cannot be made into an object
   |
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  --> src/jobs/mod.rs:24:14
   |
20 | pub trait Job: Send + Sync + 'static {
   |           --- this trait cannot be made into an object...
...
24 |     async fn revive(
   |              ^^^^^^ ...because associated function `revive` has no `self` parameter
help: consider turning `revive` into a method by giving it a `&self` argument
   |
24 |     async fn revive(&self,
   |                     ^^^^^^
help: alternatively, consider constraining `revive` so it does not apply to trait objects
   |
24 |     async fn revive where Self: Sized(
   |                     ^^^^^^^^^^^^^^^^^

But when I try the last suggestion, I get:

error: expected one of `(` or `<`, found keyword `where`
  --> src/jobs/mod.rs:24:21
   |
20 | pub trait Job: Send + Sync + 'static {
   |                                      - while parsing this item list starting here
...
24 |     async fn revive where Self: Sized(
   |                     ^^^^^ expected one of `(` or `<`
...
32 | }
   | - the item list ends here

[taiki-e]

Seems the problem is the suggestion by rustc omits the inputs ((&self, ...)) and output (-> ...) of the function. Try adding where Self: Sized after the output of the function without removing inputs and output of the functions.

Also, the object safety issue is explained in the documentation. See that for more.

[Ploppz]

Ah I see, thanks. Not a probem with async-trait then.