Compiler should warn if a generic class extends or implements a raw type

Compiler should warn if a generic class extends or implements a raw type.


import java.util.Collection;

class Test<E> implements Int1 { // warning
     public void m2(Integer...c){}
     public void m1(Collection<Number> c){}
     // public void m1(Collection c){} // Replacing above line with this compiles.
}
interface Int1<T> {
    void m1(Collection <Number> c);
     void m2(Integer...c);
}