A DESCRIPTION OF THE PROBLEM :
Using an switch-on-enum syntax causes all enums that are referenced by switch-on-enum to load. This is not allowed by JLS, as JLS in https://docs.oracle.com/javase/specs/jls/se11/html/jls-12.html#jls-12.4 says that "A class or interface will not be initialized under any other circumstance".

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the executable test case

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It should throw null pointer exception without showing any text.
ACTUAL -
It shows `Bar` followed by `Foo`.

---------- BEGIN SOURCE ----------
enum Foo {
    ;
    static {
        System.out.println("Foo");
    }
}
enum Bar {
    ;
    static {
        System.out.println("Bar");
    }
}

public class Example {
    public static void main(String[] args) {
        switch ((Foo) null) {}
        switch ((Bar) null) {}
    }
}

---------- END SOURCE ----------

FREQUENCY : always