// Test case for Issue 1397.
// https://github.com/typetools/checker-framework/issues/1397

public class Issue1397 {

    class Box<T> {}

    abstract class CrashCompound {
        abstract <T> T chk(T in);

        abstract <T> T unbox(Box<T> p);

        @SuppressWarnings("units")
        void foo(Box<Boolean> bb) {
            boolean res = false;
            res |= chk(unbox(bb));
        }
    }
}