-Xsource:3.0 produces warning for a case class extending AnyVal

[thesamet]

Somewhat similarly to #11657 , the following code:

case class Foo(x: Int) extends AnyVal

produces:

Auto-application to `()` is deprecated. Supply the empty argument list `()` explicitly to invoke method hashCode,
[warn] or remove the empty argument list from its definition (Java-defined methods are exempt).
[warn] In Scala 3, an unapplied method like this will be eta-expanded into a function.

when compiling with -Xsource:3.0

[som-snytt]

Yes, this is warning about the same synthetic code as the other ticket:

override <synthetic> def hashCode(): Int = Foo.this.x.hashCode();