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// Test case for issue #238: https://github.com/typetools/checker-framework/issues/238
import java.util.ArrayList;
import java.util.List;
import org.checkerframework.checker.nullness.qual.UnknownKeyFor;
class TestInfer {
<T extends Object> T getValue(List<T> l) {
return l.get(0);
}
void bar(Object o) {}
void foo() {
List<@UnknownKeyFor ? extends Object> ls = new ArrayList<>();
bar(getValue(ls)); // this fails, but just getValue(ls) is OK
// casting is also OK, ie bar((Object)getValue(ls))
// the constraint should be T<:Object, which should typecheck
// since ls:List<? extends Object> unifies with List<T> where
// T<:Object.
}
}
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