Consider:

{code:java}
public interface A {
  static A localSingleton() {
    class B implements A {
      private static final A INSTANCE = new B();
    }
    return B.INSTANCE;
  }
}
{code}

The idea is to avoid exposing publicly class B (as classes declared in interfaces are `public` by default).

The class above compiles with Java 23 and less, but fails with Java 24-ea+30 with:

{noformat}
A.java:4: error: local class B cannot be instantiated from a static context
      private static final A INSTANCE = new B();
                                        ^
1 error
{noformat}