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import java.util.List;
import java.util.Optional;
import java.util.function.Function;
class Main {
{
List<Optional<Function<String, String>>> list = asList(of(<error descr="T is not a functional interface">Main::identity</error>));
}
static <T> List<T> asList(T a) { return null;}
static <T> List<T> asList(Optional a) { return null;}
static <T> Optional<T> of(T value) { return null;}
public static String identity(final String s) {
return s;
}
}
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