1. Assume following 3 classes in same package:

package push;
public class ClassA {
    public void m1() {}
    public void m2() {}
}

package push;
public class ClassB extends ClassA {}

package push;
public class Call {
    public void m(){
        ClassA a = new ClassA();
        a.m1();
        a.m2();
    }
}

2. Call Push Down on method m1() and without any warning you'll get broken code:

package push;
public class ClassA {
    public void m2() {}
}

package push;
public class ClassB extends ClassA {
    public void m1() {}
}

package push;
public class Call {
    public void m(){
        ClassA a = new ClassA();
        a.m1();
        a.m2();
    }
}

>> there should be warning, that method m2() wil not be accessible from class Call "a.m2();"

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