compileTimeOnly does not work on a trait/class

[bishabosha]

Minimized code

@annotation.compileTimeOnly("Foo should be erased") trait Foo
@annotation.compileTimeOnly("Bar should be erased") class Bar
val foo = new Foo {}
val bar = new Bar {}

Output

compiles ok

Expectation

error Foo should be erased, Bar should be erased, as in Scala 2.13

[odersky]

Not sure we need to have the same behavior here. compileTimeOnly is not specced anywhere as far as I know. And it will be replaced by erased, or so we hope.