Consider code like:
```
public class QualEnum {
    private void test(E e) {
        switch (e) {
            case ea -> {}
            default -> {}
        }
    }
    static final E ea = E.A;
    enum E {A}
}
```

This should fail to compile with a proper compile-time error, but it crashes javac:
```
java.lang.AssertionError
	at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:155)
	at jdk.compiler/com.sun.tools.javac.util.Assert.check(Assert.java:46)
	at jdk.compiler/com.sun.tools.javac.comp.Lower$CompileTimeEnumMapping.caseValue(Lower.java:505)
	at jdk.compiler/com.sun.tools.javac.comp.Lower.visitEnumSwitch(Lower.java:3866)
...
```