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// Test case for Issue 1809:
// https://github.com/typetools/checker-framework/issues/1809
// Note that -AatfCacheSize=5 is required to exercise the problem.
// This test is to ensure the basic code compiles.
// For a reproduction of the issue, see checker/jtreg/nullness/Issue1809.java
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;
@SuppressWarnings("unchecked")
abstract class Issue1809 {
abstract <T> Stream<T> concat(Stream<? extends T>... streams);
abstract Optional<A> f();
private static class A {}
interface B {
List<C> g();
}
interface C {
List<S> h();
}
interface S {}
private Stream<A> xrefsFor(B b) {
return concat(b.g().stream().flatMap(a -> a.h().stream().map(c -> f())))
.filter(Optional::isPresent)
.map(Optional::get);
}
}
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