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import java.util.*;
class A<<warning descr="Type parameter 'T' is never used">T</warning>> {
}
class B<<warning descr="Type parameter 'S' is never used">S</warning>> extends A {
}
class C extends A<String> {
}
class D extends A {
}
public class Main {
public static void test(Collection<? extends A> <warning descr="Parameter 'c' is never used">c</warning>) {}
public static void main(String[] args) {
Collection<B> bs = new ArrayList<B>();
test(bs);
Collection<C> cs = new ArrayList<C>();
test(cs);
Collection<D> ds = new ArrayList<D>();
test(ds);
}
}
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