import javax.validation.constraints.NotNull;
import org.checkerframework.checker.nullness.qual.*;
class Issue308 {
@NonNull Object nonnull = new Object();
@Nullable Object nullable;
@NotNull(message = "hi") Object notnull1 = new Object();
@NotNull(groups = {Object.class}) Object notnull2 = new Object();
void foo() {
nonnull = notnull1;
notnull2 = nonnull;
notnull1 = notnull2;
nullable = notnull1;
nullable = notnull2;
}
}