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// Test case for Issue 1815:
// https://github.com/typetools/checker-framework/issues/1815
import java.util.List;
import java.util.stream.Stream;
@SuppressWarnings("") // just check for crashes
abstract class Issue1815 {
class A extends B {}
static class B<One extends B<One, Two>, Two extends B.I<One, Two>> {
static class I<Three extends B<Three, Four>, Four extends I<Three, Four>> {}
}
abstract A f(Integer x);
void test(List<Integer> xs) {
Stream.of(xs.stream().map(x -> f(x)), xs.stream().map(x -> f(x))).flatMap(stream -> stream);
}
}
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