(With or without a break at end of the prior case)

public class X {
    public static void main(String [] args) {
        Object [] o = args;
        switch (10) {
            case Integer i:
                System.out.println("i = " + i);
            default:
                System.out.println("Unreachable");
                break;
        }
    }
}

this code fails to elicit a diagnostic about unreachable default clause.